One tradition 930 has followed the first few years (which admittedly, is a bit creepy) relates to a clown.
We work out of the basement of a church, and one day back in 2011 we found this weird Clown in a cone type puppet. (Like one shown below, but less decorated... wish I could find a picture of ours)
When we were crating the robot up for championships that year, someone put it in the crate and it was a pretty funny surprise when we opened it up a few weeks later (having forgotten that we had put it in there).
Each year since then, we have always packed the clown in the robot bag, and then proceed to have it up somewhere in our pit to keep an eye on things during the competition. It is an incredibly weird tradition, but team members just keep on doing it.