In the sports centre changing rooms:
Girl 1: I changed gyms because I wanted to use the pool
Girl 2. I like swimming, but (slight pause) I always drown.
Five minutes later outside of the changing rooms, I see them departing.
Girl 1: So are you are coming again tomorrow? To the gym or the pool?
Girl 2: (emphatically) Gym.
Good decision there to avoid drowning.