The town’s corrupt mayor, Diamond Joe Quimby, still sounds like Edward Kennedy. And Otto the school-bus driver has been stoned since 1989.

Otto Mann has appeared in other 100 episodes of The Simpsons but how much attention were you paying to the Springfield Elementary bus driver? Remember to take our quiz below and you can check out ...

Hands up if you didn't realise Otto's surname was Mann until right now?! Another memorable character voiced by Harry Shearer is the free-wheeling, rocker and bus driver, Otto.

Enter the eTrans Bus. It’s more costly than traditional diesel or hybrid buses, but promises of recouping the additional cash within a few years might be enough to lure in early adopters.

When Otto crashes the school bus, it's revealed he's never actually had a driver's license, getting him fired. Otto comes to stay with the Simpsons.

From stoner bus drivers to Mr. Burns, here are Harry Shearer's choicest 10 best 'Simpsons' characters ...

Metallica made Springfield elementary school bus driver and metalhead Otto’s day in this episode, which introduced them standing on the side of the road after their tour bus broke down. Best ...

Since The Simpsons has been on TV for, like, a million years, and has created some legendary characters outside of the five nuclear family members of the Simpsons, it makes sense that there would ...

And it did so at heavy metal’s expense. At the start of the episode, school bus driver Otto reveals to Bart that he’s about to pop the question to his girlfriend.

While 'The Simpsons' has been graced by the voices of hundreds of celebrity guest stars, many of Springfield's permanent residents were inspired by real people. The resemblance is uncanny.

The bus driver, Otto Nuss, turned himself in to police after transporting 13 children against their will. School bus driver Otto L. Nuss is seen in this undated family photo.

The entire lineup of Metallica made a rare cameo when their cartoon tour bus broke down while driving through Springfield. In this 2006 episode, bus driver Otto drives past the band's bus while ...