MOM'S SECRET ROOM

[ONEBGG]

Physicist, a Biologist, and a Statistician see two people enter a house, and then after some time, they see three people leave the house.
The Physicist concludes, "My initial observation must have been incorrect." The Biologist concludes, "Clearly, the two reproduced..." The Statistician concludes, "Well, if one more person enters the house, then there will be no-one in the house!"

*A big thanks to Paul Dickman for this subtle piece of humor that many of my friends just don't understand.