Doonesbury by Garry Trudeau for July 08, 1974
Zonker: Uncle Duke? Duke: Zonker! What a surprise! Long time, hombre! Zonker: Yes, it certainly has been. What are you doing on the floor, Uncle Duke? Duke: Killing bats with my ruler! Really big ones, too! Zonker: Bats? Duke: Yeah - whenever I have too much tequila and coke, I start to see huge, hairy bats! So tell me - how's your mother?