Well, seeing as I was a spectator this year, looking to learn more about how the top teams build their robots, some teams were particularly helpful.
1114: I walked by their pit and stopped for quite a while to look at their robot. I asked if I could take pictures, and they said yes, like most teams would. After I eyed the robot for a while longer, they asked if I had any questions, also normal. One thing led to another, and soon, I was getting almost a full tour of their wonderful machine

. It was amazing, a
STUDENT (not a mentor) told me each how almost each and every part was made. I learned so much from this team. It was amazing!
1629: When walking by their pits, I asked about their tank treads. Eventually me and my Dad got into a discussion with them about structuring not only an FRC team, but a whole district of teams, from JFLL to FLL to FTC to FRC, and funding it all too! U-City might be seeing some major changes around here thanks to them!
Also, if you would mind me adding a third, all of the teams who hosted a conference that I went to see (Karthik, 359, 365 and the hall-of-famers, and 79). These were fantastic, thank you guys so much!