What is it about bad songs that ends up getting them stuck in your head?

Everyone has had a song stuck in their gray matter. Right now I’m going on day 4 of having Intercourse With You from Family Guy in mine!

Another really bad song that I got stuck in my head is I’m in Miami B*tch. To make it worse I often start thinking of my own lyrics which drags out how long these horrid tunes bounce around in my skull.

What are some of the most despised songs to infiltrate your cranium and how did they get there?