ORIGINAL: flyinfeathers
Got an idea last year around Halloween time. I noticed Wally World had some welcome mats with the Halloween theme. The difference was......when you step on the mat it lets out this blood curdling scream.
So.......my plan is to place this mat strategically under my buddies stand....brush it in with a few leaves.......and wait for the excitement to begin. I don't think he has heart problems...... yet. 
I like pranks as much as the next guy, but if someone did that to me, I would probably kill them.