What helps a great fart is a persons reaction to it, after I blast one the person(s) near you give some sort of comment or or reaction is worth a good laugh. the greatest response usually comes from a SBD (silent but deadly).  this happend a couple of weeks ago mygirlfriend and I were in a small store in the mall.  i was in one area looking at wall clocks, and i let loose what i thought might be a harmless SBD.  well, as it turned out it was quite nasty and my girlfriend was comming toward me and I had to move because of the smell.  I moved about 5 ft away behind some merchandise stacked on the floor.  she stopped, looking at the wall clocks, then moved toward me acouple of feet and she yelled " OH MY GOD!!" and immediately covered her nose and swiftly moved away. the heads turned in this small store and I am laughing real hard.  you can't ask for a better reaction than that.