Ear Worm: Anime

Another proof of Japan's excellence in weird and catchy things. You'd think not being able to understand Japanese would help, but nooooo...

Looks like almost all anime has at least one piece of music tailored to be an earworm, as a huge amount of them succeed. If you don't remember about a music featured in a series, you usually don't remember about the series at all.

90% of anime theme songs. Here's some with specific pages:

Specific examples are below: