What's your favorite Backstreet Boys, N*Sync, A*Teens, and old school Britney song?

For all the 90's kids (or anyone else) what were your favorites? Here are mine:

Backstreet Boys: Everybody (Backstreets Back) or I Want It That Way - but I'll go with Everybody since that's a little more original haha.

N*Sync: Bye Bye Bye - Not an original choice, but by far my favorite. I use to listen to this sucker on repeat when I was 9 years old.

A*Teens: Floor Filler - I still love this song... it's one of those that are still on my ipod along w/ Upside Down :)

Britney: Lucky - I have about 5 favorites, but this one is a keeper. The chorus is soo fun to sing along to - "and they say shes a lucky DUN DUN DUN she's a star, but she cries cries cries in her lonely heart thinking, if there's nothing missing in my life, than WHY DO THESE TEARS COME AT NIGHT!!" haha.. <3