Devorced
A guy calls up his ex-wife and, disguising his voice, asks to speak to himself.
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"Sorry, he doesn't live here anymore, we're divorced!"
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Next day, the guy does the same thing with the same results.
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He does this everyday for a week, and finally his ex-wife realizes who it is that keeps calling.
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"Look, Bozo! We're divorced! Finito! End of story! When are you going to get that through your fat head?"
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"Oh, I know! I just can't hear it enough!"