Anyone else try to pull a 'jay' at a party and end up being a total will?

I was about 17, at a house party trying desperately to talk to a girl I fancied (who was clearly just being polite). i was trying to look smooth, holding a warm can of cheap lager like I owned the place, and decided to lean against the kitchen counter all casual, like jay would. you know, all alpha, waiting for the "clunge" to just appear.

The problem is, I leaned back too far. the counter wasn't actually a counter it was a free-standing unit with one slightly wobbly leg. I pushed, it tilted, and I immediately fell straight backward into the recycling bin behind me.

The lager went everywhere, covering me and, tragically, the girl i was talking to. she didn't laugh, she just looked at me with that perfect, pitying "oh, friend" look. I ended up spending the rest of the night next to a radiator, smelling faintly of stale beer and humiliation. It was like watching a montage of the most pathetic moments from the series, starring me.

What's your best story of trying to be cool in an inbetweeners situation but failing so hard you became the joke?