1) Install the Community Bonus Pack 2 (CBP2) to your Unreal Tournament 2004 - CBP2 is freely down-loadable from the internet (you can find it, for instance, via www.beyondunreal.com).

2) Start a regular deathmatch in the map Killbillybarn (DM-CBP2-KillbillyBarn).

3) In the map, near the wooden fence, there is a small shed. You can recognize it from the lightning gun that you can pick up there.

4) Pick up the lightning gun, and walk to the fence immediately behind this small shed. You will see a small rock formation ahead of you. If you look carefully, you can see a red mark on these rocks. Aim at it, and fire (works with many weapons). Also, make sure when you fire, you are not zoomed in.

5) You will get a message saying "The truth is out there", but that's not all. Keep watching a few more seconds in that direction... You'll see! (I will spoil it for you... it's an egg, right?)