Something I've noticed in recent weeks/months.

Poster 1. You said such and such.
Poster 2. No I didn't
Poster 1. yes you did.
Poster 2. prove it
Poster 1. I can't be arsed
Poster 2. There! I didn't say it.
Poster 1. Yes you did
Poster 2. Show me the post
Poster 1. There you are
Poster 2. ……………….. silence

We used to have a poster who enjoyed this trick time and again.

You silly buggers (and one in particular) keep falling for it.