Unintentional humor
From Freepedia
Unintentional humor is the act of making other people laugh without actually trying to. There are several different kinds of unintentional humor that arise out of various situations.
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Unintended contradiction
It is possible for unintentional humor to arise when two different well-meaning people contribute independent pieces of information, but in combination, they contradict each other. The image on the right is an example of this.
Missteps
A misstep in the (in)appropriate environment is often considered humorous, that is the tension or embarrassment it creates is released by laughter. Examples are misspeaks or falls by a high ranking person (i.e. a president), catching somebody at an official event with inappropriate manners or embarrassing body noises.
