Laugh-a-line

One day, a little boy visited a doctor for a vaccination. After the doctor gave him an injection, he tried to bandage the boy's arm.

One day, a little boy visited a doctor for a vaccination. After the doctor gave him an injection, he tried to bandage the boy's arm.

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"I think you'd better bandage the other arm, doc!", said the boy.

"But, why? I'm supposed to bandage the injected part of your arm to let your friends know not to touch it."

"Doc, you don't know my friends!"