While this is one of those 'scourge' calls, the rule exists for a reason, and there are occasions that it must be used. Never had it in a varsity or NCAA game, but had it in a sub-varsity game (before my FBS days). Ball carrier is breaking through the line, and is being slowed by several B defenders. A teammate out in front of the BC (and totally in the open, so everyone in the stadium can see him) turns around, and sees the BC being slowed by the defenders. So he reaches out, grabs the BC by his FACEMASK, and begins pulling him forward. BC gains nearly 5 more yards before finally going down.
Kinda hard not to make that call.