i want to pull a prank on some random people, what is a good one i can do?

Put some fishing line through the center of a dollar bill, tie a knot at the end (so it won't pull through.)then crumble the bill - slightly - THEN go to a public street, letting out about 15 to 20 feet of line drop the bill when no one is looking ...then walk about 12 feet away...lol ...people will see the bill & reach for it...tug the line BEFORE they reach it - or watch as the wind blows it around - keep doing this til someone is fast enough to snag the $1.00...then (when the secret is blown) go over and give them the buck - it's worth it ...and have a good laugh w/ the people around...take 3 or 4 dollar's so, once the people disperse ;you can repeat it. ( quite cheap when you think of the fun you'll have - watching people chase this dollar around.) it's easy, safe and will brighten someones day. Peace

I would suggest something with the following guidelines:
1. Do not do anything that would hurt people or make them want to shoot you.
2. Do not do anything illegal - the fun might not justify the legal consequences.
3. Do something that the person can laugh and enjoy the prank with you.
4. Be prepared to compensate your victim if need so (times are hard, they may want to sue you).
The best thing to do is to do it someone that you know and is understanding.
Remember, you reap what you sow.

i would suggest http://improveverywhere.com/
these guys pull the MOST AMAZING SHIT
personal favorites of mine...
in school hallways/ public walkways, fill up the street with cups of water that are right next to each other. then people can't walk without tripping over cups and getting wet.
put signs that say THE ESTABLISHMENT IS WATCHING YOU in public places