This seems to happen at every con I'm at. I'll be walking along a hallway and someone passes me and waves and says hi in a way that means that we probably know each other, but in the moment I can't remember who they are. Sometimes it's someone I met at a prior con, others it's someone I may have met earlier at the con and just had a total brain fart and can't place the face to the name.

To the guy with the blue tail that passed by me on C level near the elevators at BLFC sunday, I wasn't ignoring you, I was just being a derp when you waved and I can't place your face. Sorry 'bout that ><