I was watching the Transporter 3 (yes, yes, I know). So, on one side I'm willing to suspend disbelief when you land on a train with a car, or it comes to being able to breathe underwater from a car tire (although mythbusters tried it out, and not so much), or how you can take an Audi from the bottom of a lake and get it to run again in 2mn (eh, top gear kind of did that with a truck after a few hours).
But, a cell phone call from inside a car that's sinking under water? Seriously? Really?
I wonder if they're ok with it because most viewers don't know any better, or maybe this only bothers me because I'm willing to suspend disbelief when it comes to aliens or stunts, but not basic physics and science unless we're talking the Matrix where physics are negotiable :)