Death flag
The point where a person's death becomes highly probable or unavoidable, due to something that he or she has just said or done. May also refer to the phrase or action itself.
Ways to make a death flag:
- achieve 999 straight victories
- teach your pupil everything you know
- propose to someone before going to war
- get seriously wounded and tell your mates you'll be "fine"
- invite a detective to your next family reunion on an island
- reassure a small child that no enemy has attacked your city in 100 years
- point out the glaring lack of giant parasitic wasp swarms in your current life

"Gee, you know, the only thing that could ruin this great wedding right now is a giant swarm of parasitic wasps."