Skip over the intro at the beginning of Unreal Tournament 3. You can do this by adding -nomoviestartup to the shortcut.

Right-click the Unreal Tourtnament 3 icon and select Properties,

In the Target box, one space after the last character, add -nomoviestartup. It should look similar to this:
“C:\Program Files\Unreal Tournament 3 Demo\Binaries\UT3Demo.exe” -nomoviestartup

Click OK and you’re done. Now when you use that icon to launch the game, the movie intro will not play.

Source: Unreal Tournament 3 Tweak Guide