In the first mission you need to kill him and you can save the uncle. So I went to the office and switched the cups (first time). So I googled to see if anything else could be done with the Uncle. Turns out you can spill both drinks, they go down to his secret lair and you can either kill him or knock him out to save the uncle. Well also if you knock the guy out, you can take his body back to the interrogation room, go get the brand and brand him. This is the part that bugged the shit out of me. You have the really awesome cool way to do a non-lethal mission and there isn't a single hint or anything that suggest you could do this. I'd like to see all the cool bits in the game, but hate spoiling them by having to google them as well
Using a steering wheel on a Burnout game is like using the Space Shuttle controls to fly a kite.