I saw this sign outside of PHYS 145 today. It's for an event tomorrow.
"Poor yourself." Why would I want to poor myself? I'm already poor.
Seriously, I'm surprised. I haven't seen this error often. More common mistakes are discreet / discrete, compliment / complement, and break / brake.
On a tangential note, the area outside PHYS 145 is plastered with posters advertising events for ChemClub, but I didn't see a single PhysClub poster there. Odd.