No joke, I literally laugh out loud at these.
  1. The sound of running water(there's a waterfall at work that makes it difficult to be serious)
  2. Sneezing
  3. The ketchup bottle when someone doesn't shake it
  4. A creaking door
  5. The exasperated use of "uhhh"
  6. When anyone goes "PSH"
  7. Pooping