What's something that makes you immediately put someone on your sh*t list?

Whats something that makes you immediately put someone on your sh*t list?
For me it's being excessively nice or friendly without a good reason. I'll immediately second guess that person and wonder what they actually want from me. I might play along for a while until I get comfirmation about that person motives, but generally I just ignore them outright or make my opinion of them clear.
What about you?
What's something that makes you immediately put someone on your sh*t list?
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