It's bring-your-parent-to-school-day and all the kids are taking turns walking to the front of the room with their dads to explain what they do when the teacher notices that Timmy in the back row seems very unhappy.
Teacher: Timmy, is something the matter? You can go next if you want.
Timmy: (sniffling) I can't go, my dad is dead.
Teacher: Well, if you want, you can explain what your dad did before he died.
Timmy: Explain how he turned blue and shat on the carpet?