Surprise periodic checks
Traveling and camping is a fairly common thing to do in role-playing games, especially in the fantasy genre. In GURPS, someone in the party needs to roll against Survival skill every day to prevent the members of the group from taking hit point damage. (Its counterpart Urban Survival doesn't list any negative result for failure.) I've seen players get surprised and indignant when they couldn't "just camp for the night" like they do in other games, and had to risk damage.
Are there any other skills or situations with "gotcha" effects that are commonly seen by adventurers like the one with Survival? I don't mean things like taking the lower of Vacc Suit or a DX skill when in a spacesuit; I mean things you commonly need to roll on adventures that players would not necessarily know about unless they already had the skill or ability needed.
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