The Landmine Click
In many war films, you will witness a group of soldiers in a difficult environment who are all on alert when all of a sudden there is a click. When they hear it, everyone looks back to see their partner, who appears to have trodden on a landmine. Apparently mines are the kind of weapons that don't kill you if you react quickly, even giving you as much time as you want to detonate them, so as long as he maintains his foot on the mine, he should be okay.
Landmines in real life don't function that way, despite the fact that it makes for stressful battle scenes. They are intended to be lethal weapons used in asymmetric guerrilla warfare to demoralize and disable the opposition. Expecting them to provide you with a practical warning when you step on them is absurd, and if they did, it would very certainly be seen as a serious design defect. Even the most forgiving landmines would only give you a few seconds to flee because they are built to go off as rapidly as possible, despite the fact that most of them are improvised and unexpected.