to step on a landmine; to accidentally trigger a mine

to inadvertently do something that has an unpleasant result, such as buying a bad product or visiting a disappointing restaurant; to break a taboo or offend someone by mistake

to be accidentally exposed to spoilers regarding the plot or ending of a movie, book, or show

the classic single-player computer game where the goal is to clear a board containing hidden mines without detonating any of them