Starting to really loathe the whole
Song & Dance Number that's become a huge sensation in anime recently. It's the purest form of pandering in my eyes (basically saying, "hey otaku, here's a cute girl singing and dancing, please support this "energetic" personality by buying the single and figures), often comes about in episodes out of the blue, often serves no purpose to the story, and has in the worst cases even supplanted real character development for the characters involved in the dancing scenes.
The only time I really want to see upwards of 3 minutes spent on a song & dance number during a shows run time is if the show is actually about singing & dancing or if it's going to play a big part in defining the character involved through dialogue and exposition later on. The fact that the majority of these song & dance bits usually seem to be forgotten about immediately after they've happened have lead me to refer to them as anime's own custom
"Big Lipped Alligator Moment".