We all have one or two. Well-meaning friends and family "know you like toy trains", so they proudly present you with a charming little item like a single truck wood bobber caboose for your BNSF consist or a Mickey Mouse boxcar for your 3-rail scale railroad...
So! Show us your misfits!
Actually, the only reason this is a misfit is because I don't use those couplers. I plan to restomod this caboose to postwar trucks (or perhaps get the coupler adapter, haven't decided yet) and put it into Razorback Traction Co. service... ;-)
Mitch