You know you've been in FIRST too long...

[Ben Martin]

... when you design multiple Lego League, Vex, and FRC games during your spare time

[gondorf]

you know you have been in first too long when you have so much aluminum in your blood that you set off metal detectors

[amos229]

-when your order at mcdonalds comes to 2.29 and you save the reciept
-when working on a physics problem and 229 suddenly shows up on your calculator. needless to say there were 4 firsters in the class laughing suddenly

[AdamHeard]

1. You know all the words to the Vengaboys Party Album

We actually had disney sons from nearly all the movies playing today... And even more strangely none of our female members were there...

It was interesting seeing guys complain about hitting next halfway through the Mulan soundtrack.

3. You start incorporating you mentors' mannerisms into you own everyday life
4. Your mentors no longer feel bad about calling you names

This is entirely true....


Another one to add;
You lose track of what day it is during long code-a-thons. Our programmers and myself (former programmer turned design/fab/assembly) definitely did this this weekend. (9AM to 5AM and then waking up at 8 AM. rinse, repeat)