Ok what can i bring to retreat so i could pull some pranks? (i.e silly string)?

Question

my school is going on a three day retreat b4 we start the school year what could i bring with me so i could prank some people somtin like water ballons silly sting....

Answer 1

take saran wrap to put over the toilet seats... it make for a nasty surprise for the user and a wicked laugh for you... HAVE FUN

Answer 2

flour to put in girls blowdryers so when they go to blowdry their wet hair all the flour sticks to it