Not really advice but it cracks me up every time I see it.
In one of my LFS
there's a large banner above the tanks that says "ALL FISH 2 FOR 1. No warranty on 2 for 1 fish"
So I asked "Um so that means no warranty then right?"
Reply "no no, just on the 2 for 1 fish"
Umm. Huh. Well then....