1) Rubaki (all seasons and OVAs), except for the fourth one, are very good. It's a high-quality parody of fantasy, and that's what it is.
2) Axis Powers: Hetalia, a humorous series that satirizes history and stereotypes about countries, although the manga is better.
3) Joyless Sensei, a series with a lot of humor and satire, poking fun at many topics, depicting ordinary school life with a very unusual teacher and students XD.
4) Gintama is a seinen series that satirizes everything from gamers and dentists to Miyazaki films, manga artists, and Barack Obama. It's a mind-blowing, but high-quality series.
5) One Piece is a wacky seinen series with a fantasy-pirate theme. If you're not bothered by snail-phones, cyborgs (there are almost no sci-fi elements, with a few rare exceptions) that run on Coca-Cola, fruits that give people superpowers, a reindeer doctor, and a swordsman who fights with three katanas, then I recommend you watch it.
P.S. And why, when I give people advice, do they ask, "Am I just messing with you?" O_o'''