I am terribly bad with faces.
Especially when I see somebody out of a familiar context. It was worst when I was at BMC-- I'd be so used to seeing somebody in scrubs or other hospital garb and then run into them at the supermarket or something and have no idea who they were.
I used to think Eegid was a real Irish word.
I used to think Tom Lehrer's "Irish Ballad" (aka "Rickety-Tickety-Tin") was an actual old Irish folk song, rather than a parody of one.
Next you'll be telling me that Denis Leary's "Traditional Irish Fok Song" is not a traditional Irish folk song.