It is rude to act disgusting around strangers.
Steve and Anthony are walking down the road together, when he sees a dead lizard and a stranger on the other side of the road.
Steve wants to amuse Anthony.
Steve tells Anthony an amusing story about his mother and father.
Steve waits until the neighbor is looking and picks up the lizard by the tail and holds it in his mouth.
Anthony gets a good chuckle about Steve's story, enjoying it.
Anthony is disgusted by it, not laughing at all.