What are popular group Halloween costume ideas?

Here are some ideas

  1. Alvin and the chipmunks
  2. If it's boyfriend and girl friend you could be Tarzan and Jane, with a few chimps
  3. Pink ladies from Grease (sorry if you're a male)
  4. Chick magnets (sorry if you're a female)
  5. Nerds
  6. If you have a big group the you could be the Brady Bunch