Some movies don't attempt at all too be realisitic. They're just trying to make you laugh and generally be silly. But yet no matter how completely unbelievable the rest of the movie purposely is, sometimes there are just some scenes that bug me. Here's an example:
In The Blues Brothers, I can handle an entire city police force, the army and SWAT all after two guys. I can handle driving through the inside of a shopping mall without injurying anyone or running into a concrete wall, I can even handle seeing "the light".
But for some reason when the nazi's are chasing the blues mobile to the end of the incomplete freeway, and the car reverses, flips over, and yet is some how now facing the opposite direction to make a quick gettaway, it just bugs me!