There are some pretty good on-deck shots out there (Longo's UD Masterpieces card comes to mind) but there can be none cooler than the 1980 Ed Kranepool.
As for irony: Kranepool is on-deck but this is the last year of his 18-year career with the Metropolitans. Although he's about to bat, Kranepool's looking back over towards the dugout, like he's showing the youngsters how it's done. Only he's not swinging the bat. Rather, it looks like he's using it for sword practice or something. Strange, strange stuff. If you've got a letter on-deck card I'd love to see it!
Have a good one everybody and good night Pumpsie Green, wherever you are!