What had he expected? Who in their right mind would let George try new products on them?
Ron stood motionless as George tried hosing him down for the seventh time that afternoon, but still the slime wouldn't budge.
"Well," George said, and Ron came very close to punching him. What right did he have to be that cheerful? "At least we know it works." Ron lunged then, but George managed to dodge out of the way in time. The slime on Ron's clothing was drying, making his movements slower; that's what it was.
"To be fair," George said, now a safe distance away from his brother. "You did agree to this."