Junjou Romantica

As a yaoi or shounen-ai, I can't say I'd rate this particularly highly - the characters all look the same, the tsunderes get annoying, all the characters fall in love in very unrealistic ways (ie they're "straight"), it's full of clichés and the only way you know they're gay relationships is the occasional misgiving about their future without children and how they'll tell their parents. But the romance is endearing, if more suited to straight romance, the setting is very interesting, and the humour is brilliant. I can never stop laughing when watching this, the little references everywhere and the switches to comedic art styles and the reactions of characters make this definitely worth watching.