What was the most motivating, satisfying or rewarding project you've ever worked on?

Was it because of the project itself or the team you worked with? The money you made? The impact it had? The stuff you learned?

Tell me all about it, I'm curious!

@fribbledom
"Take tote 5 and put it on lower send pad and push button." Tote gets pushed out onto conveyor and goes to next station with parts for that kit. Very cool stuff and cutting-edge at the time. Achieved 99.9999% inventory accuracy.