Love Can Kill

In plain contexts means 'to do something silly', but when said with concern about a distressed person, it is a well-understood euphemism for self-harm or suicide. Context makes the meaning unmistakable.

Literally 'to lose faculties'. Used self-deprecatingly or critically to suggest someone is no longer as sharp, alert, or capable as they once were.

Literally 'it seems like a lie to me'. A very natural way to express disbelief or that something feels too good (or bad) to be true. Common in both happy and shocked contexts.