Cartman sees measurements in the school hallway and thinks they are for length of the boys' penises, so he measures them himself and comes up with actual lengths, only to find out the measurements were how tall the boys are. Now everyone knows Cartman has a tiny penis and he is sent to anger management to deal with this.
Good episode. Parts I liked; Mitch Connor, 'I'm not Fat, I'm big boned', Cartman being the only one mad at the episode's end, etc. Not the best ever but I do think it is probably the best thus far of the 15th season, which in hindsight, is not saying a whole lot. Final grade would be a B+ or so. The first half was pretty good but I lost interest when they started rioting Fed Ex.