How about this one, it's pretty bad:

Two children were in a doctor's waiting room. The little girl was softly sobbing.
"Why are you crying?" asked the little boy.

"I'm here for a blood test, and they're going to cut my finger," said the girl.

When he heard this, the little boy started to cry.

"Why are you crying?" asked the girl.

The boy looked at her worriedly and said, "I'm here for a urine test."