Can i really be suspended for this?

okay so im known as a very active prankster in my high school, i made a swine flu spoof notice, did stand up in our talent show (which got very positive reviews) and i made something else that i will not go into detail too, but i am known as a legend for it :) I am also widely popular among the teachers, in a good way of course. Anyway, I am a freshman, and i want to pull and end of the year prank. I want it to be funny, harmless, and easy to clean up. I was thinking that i could silly string a popular gym teacher who is easy going and fun. I bought the silly string, and my parents told me i could get suspended and that i couldnt do it. Now given the cirstances i am in, and the harmlessness of the act, do you guys think it would be right to suspend me for such a harmless end of the year prank? Please feel free to post past experiances, or anything else you think of. DO NOT say that i should wait until being a senior to pull a prank. Im not that kind of kid, i am a true legend who needs to keep my streak going (not braggin)