aprill fools day                                             

for aprill fools day you could :

Steal your friends gnome from his/her garden.  sounds stupid but my friend did it! and they woke up the next morning looking for there gnome.  they were so desperate that they went round the doors looking for it.  but put it back because i could get the blame!

Go to your local joke shop and buy fake fingers or poo or garlic sweets.  and then play a prank on them.

Put lacsitive in their tea.  and listen to them making sounds in the bathroom.  but if you do this your sad sad sad.  But extremely funny.