There's a cool quirk found within packs of both Series 1 and 2 of Topps' flagship Baseball card set. They are the Home Run Challenge promotion cards, and as the name suggest these little lottery-styled tickets can earn its bearer a nice little prize if you can pick the day when said player hits a homer.
This is how it works. When you find a 2018 Topps Home Run Challenge gameplay card simply turn it over to find the scratch-off section. This will show an account number to tie into your Topps.com account; while at the same time you get to guess an exact date when you think that player will hit a home run.