I just sent off my two older boys, Brennan and Tanner, on their first overnight youth group trip (not counting church camp, of course). The other junior-high kids were milling about in the parking lot, saying goodbye to parents, and all of the advice/admonitions directed their way seemed to be the same:
"Don't act normal! Be good [instead]!"
The kids didn't even bat an eye. Junior highers are awesome.