that's a pretty hard-core prank! Holy smokes, a lot of people would be PISSED if you did that to them. I hope you made it up to your friend somehow. ...bought him dinner or something.
Quote from ElCubano:
I did something similar to a friend of mine....i was going fishing with a friend of mine on sunday morning and saturday night before the lotto numbers were out he purchsed about 4-5 tickets...sunday came around and i stepped out and got the same winning numbers on a ticket but for the following week and was able to mix them with his tickets...I knew there was a chnce he wouldnt look at the date...and lo and behold he almost fainted when he saw the number...I let him go crazy for about 5-10 minutes and then I had to bribng him back down from the clouds...thats the last time I would ever do that to someone....peace