Step 1: Prank 1: a Leaky Sink
1.Get some scotch tape (Look at the photos)
2.Be sure you're victim's sink has one of those hose things
3.Take some tape off the roll and tie it around the spout's handel. Be sure the tape is tight on there!
4.The finished thing should look like this. *Look at last picture*
5.Watch as the victim ignores the hose and turns on the sink, thus spraying them.
Step 2: Prank 2: Falling Cups
1.Some plastic cups
2.A cabinet for the cups
What you do is put the cups on a slant in the cabinet. close the door slowly so the cups don't sit back down. Once the door to the cabinet is opened the cups will fall out onto a person.
This is kinda obvious but do not use glass. If it shatters it's your fault. Again the way the things go is in order in the pictures.