101 to stand a nailpop, twice

Steffi and Alex on the couch with David. They tie his arms to the couchframe so that he can't cover his ears. Then Steffi and Alex start to blow balloons. When they are already very firm, the girls start to hammer and punch the balloons in Davids face and laugh about him. Finally they pop the balloons with their fingernails in front of Davids face.