Well prank both of them by telling one that your going to prank the other get him excited then tell the other the plan and while the other gets the excited one you get the other one. or pretend to bake carmel apples but actually color onions, change the labels of fish/shrimp spray with air freshener, make them something to eat spike their food with laxative making them fight for the bath room and then when they have to go leave only one pull of tissue and remove the toilet set, constantly tell them their musty all day let them wash up with soap but coat it with clear finger nail polish an then give them deodorant but take out the stick and replace it with white butter. Give them some oreo's but only replace the cream with toothpaste of course you got to leave some oreo's to get them wonderings whats that taste. But if you don't love those then then there's always the loosen the salt shaker