Pom Pom Fighting
From Homestar Runner Wiki
Pom Pom is a good fighter and appears to enjoy it.
The first instance of pom pom fighting is in his dojo from the theme song video where he practices his moves, this is broadened on later in the email pom pom where he gets a 1-Up beating Strong Bad. In the commentary for the same email the brothers chaps discussed wanting to make a side scrolling pom pom fighting game. This also was seen in the Strong Bad Email, personal favorites where he got into a "knife fight" with Coach Z. Later in Summer Short Shorts, Pom Pom shows off his skills with a Bo and disappears with a smoke bomb.