What are some of your rookie/silly mistakes?

[Graciebot]

We decided it would be a great idea to bolt our bumpers down and it took 10-15 minutes and four people to change them. Not fun when we had nearly back-to-back matches! Thank goodness we went with a much easier design this year...
Also, our first year we didn't understand the importance of driver buttons and took them home the first day of competition. Then we forgot them the next day. That was a catastrophe. Luckily one of the moms ran to get them once we realized where they were. Phew!