Don't let anyone tell you otherwise, being juvenile can pay off. Two brothers have proven this. They've been humorously scribbling on baseball cards since they were kids and now it's landed them a book deal. As children of the 80s, Beau and Bryan Abbott spent their allowance on their baseball card only to discover the collection wasn't worth the cardstock it was printed on. Instead of dumping the long boxes full of cards, the then-elementary-aged boys started "enhancing" them with Sharpies in "endlessly shameless and shameful attempts at making one another laugh." This continued until high school when they stopped for a while.
Mashable (link mine):
Then, while Beau was at the San Francisco Art Institute, Bryan sent Beau a care package with a bunch of newly vandalized baseball cards. Beau showed his fellow students and professors and the cards became a big hit.
Their popular Tumblr has been around since 2012, their Instagram is gaining some traction, and now their first book is coming out in early March. Baseball Card Vandals: Over 200 Decent Jokes on Worthless Cards! can be pre-ordered now for $12.76. You can also purchase individual cards directly from the Abbott brothers ($35 and up).