Another one of those ones for your pyromaniacs out there , as your your down on her quickly grab a lighter and set her pubs on fire, then quickly put it out with your mouth.
When you're banging your buddy in the butt, ejaculate, and pass out while remaining with your member still inside the anus. Then waking up, after your semen has dried up inside the anus. This results in a guaranteed sting (or kiss) as you rip your "helmet" away from the hardened semen.