What are some Anime OPs that gets stuck in your head?

[Blackangel]

are there any for you?
they don't have to be very good or your favorite. just something you can't get out of your head.

 

[Rinko]

There are too many of them
I can't think of them now but I will try to list them all out here.
But I like the Tokyo ghoul songs.

 

[Blackangel]

tokyo ghoul? you never told me
and here i thought you don't hum anything at all when it comes to anime openings and endings.