Jimmy Fallon used to do stand-up comedy outside a grocery store as he tried everything "to get famous"

He told Extra: "I was out here when I started trying to do stand up, trying to make money. I tried everything I could to get famous.

"I remember doing stand-up outside of a Vons. I heard that Michelle Pfeiffer got discovered as a cashier at Vons, and so I did stand-up and played guitar and did impressions outside of the grocery store in LA."

He would eventually get his big break in New York, as he landed a job on 'Saturday Night Live'.

He said: "I remember actually doing 'Saturday Night Live' and I was hoping just to be in one sketch, and if I was in a sketch, I'd call my mom before the show, like 11:25, like, 'Mom, I'm going to be in the show tonight, so stay up.' "

When he took over 'The Tonight Show' a decade ago, Jimmy didn't think he'd last "two years".

He confessed: "I was like, 'Oh man, they're going to fire me'. They are gonna say, 'What is this guy doing?' "

Now, he'd love to pass Johnny Carson's 29 year record to become the longest running host on late night.

Speaking at a panel during Deadline's Contenders Television event earlier this week, he said: "I'm gonna go, you guys want me? Let's break the record, let's go, let's do 30 years!"

Meanwhile, Jimmy - who insisted the 'Tonight Show' is more of a "variety" programme - still holds close some advice from Conan O'Brien, who in turn received advice from Carson.

He was told: "With this job, you'll do everything you've ever learned. Everything."

Jimmy added: "I can barely tap dance, I can do impressions... I've done all of them numerous times on the show."