hy, im 13 and my brother is 18 and I want to prank him baaad :DDD some help please ?
Put Kool aid powder in the shower head, but make sure he is the first one in the shower, it will give him a start but should be harmless to the shower as it will just wash down the drain, use cherry, strawberry, or grape for maximum effect good luck. If you are thinking more along the lines of punking him like Ashton Kutcher then see if you can enlist the help of some friends and family, they will probably have some good ideas for you and help you with your prank.
take his cell phone when you know he will need it. put it in an air tight small ziplock bag. fill a small plastic bowl with water. put the cell phone bag in the water. put it in the freezer and let it freeze solid. set the phone where he'll hear it then watch the action. it works well if he uses it to wake him up
You can take off all the cream in his shampoo then put rotten smelly cheese in it water, syrup, spray and some nasty smells mix it together and when he or she uses it he or she hair will smell nasty
put whipcream on his hand and tickle his nose or cheek soo he/she will smeare it on his face
go to youtube and search up most awesome pranks you'll get great ideas