This is a simple but hilarious prank!
Step 1 Find someone to prank. It could be anyone.
Step 2 Have the "pranker" ask the person if they would hold something for a second.
Step 3 Have the pranker give the person the item.
Step 4 As soon as the person has the item, have a few cop cars pull up.
Step 5 Have the "police" make a fake arrest for "possesion of stolen preperty"
Step 6 Have the police convince the person they are going to jail.
Step 7 After the person gets so scared, admit that it was just a prank.