I train at my university's gym. There are two power racks, and by the grace of God today, both of them were occupied by friends alternating CURL sets.
At the very least, one group was nice enough to allow me to work in with them. I did six snatch singles, gave the rack back, and then I did six clean and jerk singles.
It just irked me that TWO power racks were being used for curling, and incorrect curling at that!