Worst/ weirdest/ funniest pop culture reference (or easter egg) in a game?

[Petike]

The training level in SWAT 4 gives you the opportunity of shooting doughnuts out of their neatly packaged box. :

You can also turn on radios/stereos in the game and even switch on different stations. One or two of the bands playing are pretty obvious parodies of U2 and The Cranberries (or Corrs, if you like). :