Addendum.

I really do wonder if that lady and maybe that guy are on the sociopath spectrum.

Like, generally her affect can be off, and sociopaths can have addiction problems due to self-destructive prioritization of short-term pleasure, and the whole “lying to get free stuff” thing with small restaurant items and maybe drinks just seems off, like maybe the alcohol loosened her inhibition and led her dark behavior to come out in ways that she tries to keep in check, usually, for the sake of functioning in society.

I really do wonder... Statistically, I’m bound to come across some sociopaths as customers, while I'm waiting tables.