The owner got tired of the (w)hole business!
or
Fewer than it takes to screw in a heavy bulb.
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Two. One to take notes while the other screws it into the faucet.
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Boo-Jeans.
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They can't find the key, and they never know when to come in.
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Weeeeeeeeeeeeeeeeeeeeeeeeeee
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Just one, but he/she will spend hours checking for technical problems.
or