i've never seen it used for pleasant surprises. its basically if you want to show something (even something that does not work, like the engine-not-starting) and the demonstration does not work as expected.
They only have to be "unpleasant" in some aspect, for example because you now annoyed/bothered you team lead.
The unexpected behavior itself can still be desired, with the unpleasantness restricted to the demonstration itself.
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i've never seen it used for pleasant surprises. its basically if you want to show something (even something that does not work, like the engine-not-starting) and the demonstration does not work as expected.
They only have to be "unpleasant" in some aspect, for example because you now annoyed/bothered you team lead. The unexpected behavior itself can still be desired, with the unpleasantness restricted to the demonstration itself.