My boss decided to steal my keys and hide it - he forgot about taking keys and went home .. then suddenly remembered and had to rush back to office .. to return keys .. I only learned about it when he brought the keys back

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no, as I remember

I don't like pranks
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I've never gotten a prank, I've been very strict about it

The same prank can always be harmful and harmless, depending of the person
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Many times, I cannot remember one specifically

The dictionary defines "prank" as:
to play a trick or prank on (someone).
In your opinion, is it possible for a prank to be harmless?
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Have you ever been on the receiving end of a prank? What was the prank?

Depends on how huge the prank or depends on people

Yes I think pranks can be harmless between friends and family

Not sure.. but probably it can be harmless..