4 panel comic by War and Peas. 
Panel 1: A man opens the door to a woman in a cat costume. She says, "Hi Craig, thank for the invitation." He answers, "Who are you?"
Panel 2: She looks upset and says, "I'm Alice from Accounting."
Panel 3: He says, "Haha, I'm just kidding! I'm dressed up as someone with Alzheimers." She enters and goes, "Oh! Haha!"
Panel 4: There are many people enjoying themselves at the party while Craig stands alone in a corner thinking, "Who the hell are these people?"