"Shared Bunk Beds" joke
A six-year old and a sixteen-year old shared bunk beds, the younger on the bottom bunk, the older on the top. One night, the older one waited for the younger one to go to sleep so he and his girlfriend could have sex.
When the six-year old finally fell asleep, the older one and his girlfriend began. They were starting to get a little loud, so he said, "When you want it harder say lettuce, and when you want to switch positions say tomato."
So, she said, "Lettuce... Tomato... Lettuce... Tomato."
Shortly thereafter, the 6-year old woke up and said, "Would you guys stop making sandwiches up there. The mayonnaise is dripping on me!"
Not enough votes...