In what fabulous ways have you messed with the small freshman brains? Non-exsistant tools are always fun, such as the left-handed crescent wrench.
Wait, what? 
I’ve been using one all season!
Straight-handled smoke-shifter. Don’t get me the curved-handled one either, I don’t want to burn my fingers again.
get me some of the pneumatic fluid from the cabinet.
High resistance solder that’s actually just steel wire.
This one sort of exists (and my team has used it). Snoop Fluid, used for finding leaks.
Edited to add: I once asked a student to find me an 8/16" wrench, but I guess I’m not much of a prankster because I felt a little bad about it and ended up sharing my cookie to make up for it (no, I’m not four).
Edited again to add: Also, Team 816 should definitely make little custom 8/16" wrenches to hand out as promo items.
Make them grease up versa planetaries. So messy.
Have them find you a metric crescent wrench
have them find me the pneumatic programming wrench
A couple years back we had freshmen put loc-tite on all the Mechanum wheel nuts… all of them, just to make sure we didn’t loose one.
The nuts on on all the individual angled Mechanum wheels on the robot :eek: .