The Big Bang Theory has become one of the most successful sitcoms in television history. Over the years, it has developed a large, loyal fan base who still loves the show today. The characters and storylines have become the stuff of legend.

However, another aspect of the show that remains an iconic part of pop culture is the theme song. Performed by The Barenaked Ladies, frontman Ed Robertson once revealed his process of writing the song. Although he claimed the idea developed in five minutes, a bad experience almost caused him to reject the offer.

The Barenaked Ladies' Frontman Also Helped With The Theme Song To Mayim Bialik's Podcast

Bialik's podcast Mayim Bialik's Breakdown opens the door for its guests to discuss their mental health journeys. The podcast is meant to look at the topic of mental health through a lens that will reach people and educate them.

Bialik jokingly told CNET's I'm So Obsessed interview series that she chose the name so she could begin each episode by saying, "Welcome to my breakdown."

"It's been a real exploration of each person's approach to mental health, with an eye towards educating people," she said.

"The main concept is that it is a human right for us to know about mental health, to even know what we're experiencing, what to call it, what it means, what to expect if you do get help, how to get help, why it's hard to get help."

Among those who helped her with the podcast included The Barenaked Ladies' frontman Ed Robertson, who sings the theme song.

Bialik also shared that her own background in neuroscience has impacted her approach to the series.

"We're going to see the mental health impact of what's been going on in the world for quite some time," she told eTalk.

"The idea is for me as a scientist to breakdown the science behind a lot of things that we may not know about, about mental health or why do people keep telling me to meditate? Is there any science to that?"

The Barenaked Ladies' Frontman Ed Robertson Came Up With 'The Big Bang Theory' Theme Song In The Shower

One of the most famous and memorable parts of The Big Bang Theory is the theme song. The song is actually performed by The Barenaked Ladies. Frontman Ed Robertson once told Metro News that he initially didn't want to do the theme song.

"I actually had a lot of disappointments in writing for songs on television, like songs for some big features that never saw the light of day," Robertson said.

"The request came on for Big Bang Theory and I was a little bit jaded about the whole project, and so I really didn't bother to do it.

My manager was nagging me, going 'this would be a good idea' but I was like 'eurgh, whatever.' I totally ignored the entire thing until the morning I was supposed to get on a conference call with Chuck and Bill and present the song…which I had not written."

"I was going to get on the call and just go 'hey guys, really appreciate the ask, but I've just been too busy with touring and I haven't been able to do this, so good luck.'"

It turns out that Robertson's wife Natalie was the one who convinced him to go through with it.

"I mentioned to my wife that I had a conference call with this song that I hadn't been able to write, and she asked who the call was with," Robertson said.

"I told her it was Chuck Lorre, and she was like 'you should Google him.' So I did and was like 'oh, s***, this might be real.'

"This is what had happened before, I thought I was being asked to write the theme song for a certain project and then I was suddenly competing against 20 other writers, and they don't actually want interesting, introspective pop songs about the journey of the main character, they just want a hit song they can slap in a movie."

"So I called my manager, and he was like 'no, I think they only asked you. They want you guys to write this thing.'"

Robertson said he managed to come up with the idea during a five-minute shower.

He recorded it into the built-in microphone on his laptop and emailed it to Lorre, who requested minimal changes.

"I got on a call and Chuck, who's a musician himself, and he said: 'you know what happens at end and you sing 'it all started with a Big Bang' and you repeat that line? Can you lose that and just do once as final line?'"

"I said yeah, sure. And he went 'Great, we love it, we're done!'"

'The Big Bang Theory' Cast Had Favourite Moments On The Series

The Big Bang Theory cast also chose their favorite episodes while speaking to Entertainment Weekly. Kaley Cuoco said her favorite episode was "The Bath Item Gift Hypothesis.

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"My favorite episode will always be the Christmas episode when Penny gives Sheldon a napkin signed by Leonard Nimoy," she said. "Sheldon is so overwhelmed with emotion he proceeds to hug Penny for the first time ever! I think Jim and I had our own set of secret tears flowing."

Bialik and Rauch both chose "The Countdown Reflection."

"That episode was fun and emotional, not only because we were cataloguing a huge shift in all the relationships between all the characters in the show but it was a week during which we, the cast, got to spend pretty much every scene together," Bialik said. "That made for a great way to end a great season."