1) Don't sit in my seat and ask me to switch. Sit in your own seat and wait until I arrive.
2) Don't ask me to switch to a less desirable seat. For me that means don't ask me to sit in the bulkhead and don't ask me to sit in the window. Others may have different views of what constitutes a desirable seat.
3) FEBO plays an important role in my seat selection. If I do agree to move away from preference, I hope you'll allow me to choose my meal first.
4) Tell me that I'm switching seats and I'll start laughing. Literally. (I don't think that you personally would do this but I once had a yo-yo who tried to bluster his way into my seat. Bad move.

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