2006:
The first time we ran our autonomous in competition we did everything right... except for setting the one little bit that turns the PID on to run the flywheel motors on the ball launcher... basically, it looked like the robot threw up in multicolorful poof ball glory.
Another time, our robot was just as happy about shooting 8 balls in rapid succession at an unsuspecting FIRST sponsor wearing a bright green shirt.
2008:
When first beginning to play with the gyro, I didn't notice (for a few hours) that negative was left and positive was right (opposite math).
-q