Kurenai 6 was so ridiculous it's awesome. Totally caught me off guard. I don't think i've seen an anime musical since, urm... Excel Saga? Even the sudden drop in animation quality during the musical montage that made the characters look like paper cut-outs added to the absurdity and awesomeness. Plus, the off-key singing was just great. Without a doubt, Kurenai is the premier slice-of-life comedy this season.
On a side note, i seem to have developed some form of repetitive stress injury in my left thumb after the Persona 3 marathon yesterday. Had to ice it while grinding for exp this morning.