Softball lines inherit baseball's base system and add the rec-league social scene — beer-league evenings where the game is half the point and the cookout after is the other half. Pitch-perfect and home-run material carries easily to anyone.
The underhand-pitch jokes are the category's own: an opener described as a gentle underhand toss is honest advertising for how these should be delivered.
Softball's rec-league culture is the point: co-ed rosters, low stakes, and a social calendar disguised as a sport. Half the leagues exist so adults can meet people, and this material simply says the quiet part with better puns.
The post-game cookout is the venue of record; the base-system inheritance from baseball needs no glossary anywhere on earth. Diamond-adjacent material continues in the baseball lines, and the whole league plays in the sports collection.