So many,,,
Here's two to start with.

Went out clubbing many moons ago, and before I knew it, I was mashed up on alcohol and as many other *ahem* substances I could get my hands on, beyond all belief.

On the way home in the taxi, at 5am, I though it would be a good idea to call in on a friend.

I got the cabbie to drop me off, and climbed up onto the balcony so as not to wake everyone else in the house. I tapped on the window. No reply. Knocked - still no reply. So I started banging really hard, shouting 'OY! FUCKING WAKE UP!'.

Just then, the curtains seperated a bit, and a completely petrified female face appeared not 6 inches from mine - a face I had never seen before in my life.

Wrong balcony, wrong house, not even the right street.

Which reminds me of another quick, simple but effective one..

I was a regular at a nightclub a few years back, and there was always someone there who I knew. I got in, went to the bar, and saw a friend standing chatting to a group of people, with his back to me. I ran up behind him, hooked my arm round his neck, and went 'Waaaaaaay!!' while grappling violently but jokily with his head. It was only then that I realised he was a complete stranger. God. I still break into a cold sweat thinking of that one, and it was 10 years ago.
(8-Ball, Mon 28 Nov 2005, 11:36, Reply)