One gal was proud of the fact that she had gotten her base weight down to 15 pounds. She borrowed some UL pack for a group trip, and we had all arrived at the trailhead. Everybody scampered around loading up. Then I got one of the guys to distract this gal, so he led her out into a meadow to show her a flower. While she was away from her pack, we added a 20-pound rock to it. Then I signalled the guy to bring her back. With everybody standing around, I said, "Let's saddle up." The gal swung the pack up onto her shoulders and immediately got the heavy surprise. She started to stagger off down the trail with it, but we had to break it to her as a joke. It would not have been a joke if we had let her go very far with the rock.