Smile God loves you . But I don't (Humor)

While waiting in my doctor's office I overheard a young boy and his Grandmother talking. She asked him how was his first day at school and he replied that he got hurt. So she asked what happened.
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He said; "I was playing with some friends and ran into a tree." 
With surprise she asked; "Oh my God, why did you run into the tree?"
In the voice of innocence he replied;  "Because the tree didn't move."
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Everyone in the office burst out laughing.