i think the movie "stripes" probably planted the seed of a bus conversion for me. but tonight, my brain farted up a bus movie that i'd seen even prior to "stripes".
I love old movies. They don't make em like that anymore; so silly and light hearted . now i am going to look up Stripes to see which bus you are referring to.
The predecessor to the Airplane! movies but just didn't have that ZAZ to be as popular. Good thing I love obscure and outrageous old movies! I found The Big Bus on DVD years ago.