Do you go places much?? go to parties, pubs, taverns, nightclubs, whatever your thing is - meet people... lots of people...
Me and mates dare each other to sy stupud shit to people, or ask them to something stupid. It does one of two things
1. Makes us all laugh and at someone doing something stupid or one of us getting rejected or punched
2. They do/dont do it, but they are curious, and come over and talk to us.
It has its flaws, like possible trouble and usually a complete loss of whatever small amount of dignity an 18yr old has, but the fun outwieghs the flaw.
Hell, i live in sydney. I met my girlfriend when i was absolutely pissed in a park in noosa. a mate jumped off a balcony and they thought he fell - that got them out.. then we pretended we were bushes. Then their parents came... but we went back the next day and actually talked soberish. The rest is history.. we lasted 14 months but are still good friends.
Moral of this long, tired, semi mumble - stupidity brings attention, and attention can bring whatever you want it to