A little while ago someone wrote to me, in a not-too-friendly internet exchange, "take care, man". I interpreted that as a threat, but now I realize that Americans often use this expression "take care" in a very friendly, benevolent way when leaving each other. So my two related questions are:
- Considering this widespread usage, is it still possible (in the US) to use that expression in a threatening way?
- If you wanted to threaten someone (!) what would you say? I'm thinking of some scenario in a film where a character approached by some suspicious guy would want to say "be careful [ I'm armed]". Is "be careful" right? Is some other expression more adequate?