Thanks for sharing everyone, I think this one deserves an honourable mention.
About a month a go i was in a lift at uni and let out a little message. Felt smug as fvck for a second or two until my stomach began to ache and the most violent oder began to fill the box. When this thing made contact, the air became poisoned by a thick, heavy, warm and absolutely disgusting stench. If the smell wasn't enough, the pain and the moistness I was feeling told me to head straight for the nearest bog.