Collecting topics - bonus babies / cameos

Collecting topics cards are usually common cards with unique characteristics - I collect at least 10-15 of them, including ones that seem to be 'popular' with other like minded bloggers; facial hair, play at the plate, pitchers hitting, etc.

My favorite one or the one that got me started in this whole mess were cards featuring 'bonus babies,' like I read in a 1997 Beckett Magazine story - where notable players would be making 'cameos' on otherwise common players' cards.

It is fun to look for bonus babies/cameos/collecting topics cards because there is no set checklist, no real guide - when digging through a bunch of commons cards, it is fun to think of all the themes/collecting topics in my head and seeing if I can add one, two or more cards to the mix.