Try going a whole day replacing lol with pluff... Don't really know what this thread is about but felt like saying something so yeah...
Guerilla glueing your schools doors shut is always a fun prank. Make sure you give enough time for it to dry though (approx. 6 hours).
Their is always the classic glue a quarter to the floor infront of the quarter mechine. It is a little mean to the little kids, but it can be rather funny.