My dad once found a French petrol station unattended, and pushed the big red button in an attempt to summon assistance. It turned all the pumps off. :)

I thinking something with flashing lights and a siren, followed by a recorded message of "Yes, its Friday, w00t!"

Here in the Western US, we have an office supply company that has a big red "easy" button. There are commercials that when people push the button everything gets easier. My boss has one on his desk, but when you push it it just says, "That was easy" but doesn't do anything else. :(

Aw, that's no good! It's not a proper red button unless sirens go off and things explode and stuff!

Yeah, that's what I was voting for: Explosions and stuff. Imagine my disappointment.

I'll get you a red button darling!