Drumstick Gang

Go to a fancy restaurant with 5 of your friends. Bring duct tape but hide it. Have everyone wear a handle bar moustache. Have everyone order chicken but make sure its on the bone and comes with a drumstick. When the food comes- have everyone grab a drumstick and head to the bathroom. Wait until its just the 5 of you and one random guy. When he starts to pee- attack him with your drumsticks. After you have delivered a good beating- yank his pants down and place one drumstick in his crack (but prop it so its standing straight up)- then place the other drumsticks around his head and duct tape them so they stay. Also wrap the duct tape over his eyes. Place a card on the table that says "DRUMSTICK GANG AGAINST CANCER"- That way nobody can really get that mad at you. If he runs out of the bathroom - peoples reaction would be priceless- but even if he doesnt- this will still haunt him forever.

Nice Horsey

You decide its time for the hospital to have some fun. You release 5 large broncos into the hospital, but make sure it is at 4 different exits of the hospital.
Hopefully, one horse will make its way to the ICU
and smash into repsirators; and just cause people to run for their lives.
Now this would be hysterical, like for example, you to turn the corner and you see old people and young running for their lives and down the hall you see a giant horse galloping.
Also to piss the horses off, brand them as you release them into the hospital.