It's crazy how just putting the word "test" after something can make it stressful... go climbing outside and belay a couple buddies? Show me how to use the gri-gri, and we're good to go 5 minutes later.

Put someone on the spot in a gym, ask them to tie a figure8-knot and run a gri-gri, and there's a good chance they start having an internal mini-panic-attack.