At their first pre-season game, which was free, I even bought a Hanhwa Eagles baseball cap. I never wear a hat, but I liked the black color and open mesh, and I was in the spirit of the game at the time. I fell in love with the cap, and found I liked to wear it outside on sunny days. A short time later, I left it on a train. I checked the Lost & Found in Seoul Station the next day, but nobody turned it in. Oh well. Easy come, easy go.
I think I'll try to teach a lesson this semester using baseball as a topic. If you'd like to do the same, here's a link I found: http://busyteacher.org/11500-how-to-bring-baseball-into-classroom.html
There are also a good number of decent free worksheets and lessons online.