When was the most inappropriate time you bursted out in laughter?

During the 'in memorium' section of the closing plenary of a programming competition.
There was a reason.
But I don't think it would make me look any better in the retelling.
Suffice to say the entire back row of those I was with spent a good five minutes trying to suppress the laughter and the effort made it funnier for everyone else. I like to think we managed to make it look like weeping rather than giggling but I'm 95% certain that's not even close to being true.

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