How can i get my boyfriend back?

We're in our mid twenties and have lived together for 3 years. We always joke with one another but lately its just jokes on me. If he is not farting on me, in the hot shower as he is on his way out, or in the car as he locks the windows he is sneaking up behind me with an air horn taping down the leaver on the sink spout so I soak myself or he is putting tape head level so I walk into it. He's always getting me when his friends are around too. I'm fresh out of ideas and asking him to knock it off doesn't help. What should I do to get him back?