Fleeceball is a game that is sometimes played in Big Nate. It's first and final appearence so far was in Big Nate Stikes Again.
Fleeceball is said to be really simple. It is the exact thing as baseball, but you play it indoors instead of outside. The rules are mostly the same, except for the fast you use a broom handle instead of a baseball bat, and you use a puffy ball instead of a hard ball as used in Baseball.
Currently no injuries have been recorded for playing Fleeceball in Big Nate. The only time somebody got almost hurt was when Chad got "drilled in the face" with a ball while playing Fleeceball, but afterwards Chad turned out to be great, with him saying "I didn't even FEEL it!".