If you really want to change the mood of someone, just do a prank with him. Short and quick prank is enough to scare, squeeze and stunt others.
There are many types of pranks in the world. If you called a friend and pretend to be someone else then it is a prank phone call. Some pranks can be nasty and even risky, while others are senseless. Some people prank their friends, while others prank people they dislike. Some people prank with every one even with strangers just for fun and humour. A less common meaning of prank is to dress up in a dramatic or silly way. Here I got one amazing silly prank for you.
A man in a shopping mall wearing a bee costume is standing still and pretending to be a bee stuffed model, who knows he is a real bee dummy or a man wearing costume. A guy with a carriage is passing bee calmly; he is unaware of what is passing by sight. Suddenly bee woop him and scared the hell out of him. With this action of bee he get un balanced. When he realized that bee is a man wearing costume and it was a prank he slap back as a reward to bee.
Hope you enjoy this!