There are several cases of people getting fucked up doing that. There was also funny and real medical case where two gay's were "gerbiling". The string they tied to the gerbil came undone, so his buddy lights an lighter to see if he can see the gerbil and boom! The gerbil shot out like a potato gun breaking the guys nose, and really fucked up the other guy. Before you think about sticking a gerbil up your ass, there was also a guy at my old highschool in NC that let his pet gerbil crawl up his ass. I guess it kept running as if it was running through a toilet paper roll, and it suffocated and died. It was stuck in him, and after a couple of days he went to get it surgically removed. What would he say to his parents or the surgeon? the gerbil got out the cage while he was sleeping, climbed up the bed and ran into his ass? Anyways you could imagine what that did to his reputation. Now he will always have people pointing at him saying "hey, isn’t that the guy that stuck a gerbil up his ass?". I just realized how far off topic I got from when I started this response. Never mind the gerbils, but I would not recommend lighting farts. You keep it up and you will soon find a bag that you shit in attached to your stomach for the rest of your life.