anesthesia
"Had a colonoscopy for the very first time and they used propofol. They told me I might stay awake during the procedure but that most people decided/tried to fall asleep anyways (I didn't even have to make a decision because 2 seconds after the nurse plugged it into my IV, I was out cold!) 

When I woke up, I didn't remember a thing from the procedure, and I was only asleep for maybe twenty minutes after the procedure finished. 

The only side effect I noticed was that I had the giggles for about fifteen minutes after I woke up--I couldn't stop laughing at everything! That might've just been because I was tired, but it was really funny!"