1. dogs
  2. cats
  3. monkeys
  4. unicorns
  5. women
  6. men
  7. people
  8. prostitutes
  9. Windows-users
  10. Linux-users
  11. Mac-users
  12. heroin addicts
  13. parrots
  14. businessmen
  15. clerks
  16. programmers
  17. wives
  18. husbands
  19. mathematicians
  20. physicists
  21. scientists
  22. moviecritics
  23. actors
  24. monks
  25. writers
  26. caterpillars
  27. fish
  28. pokemon
  29. cartoonists
  30. IT-professionals
  31. computers
  32. waiters
  33. robots
  34. Justin Bieber fans
  35. Nickelback-listeners
  36. classical music lovers
  37. oenophiles
  38. audiophiles