We had a brief discussion, during which they suspended this bizarre practice. They informed me that they were drunk. I singled out the most sober of the group and said "Wait a sec, this guy looks sober. GET THIS MAN A SIX PACK OF BEER, STAT!"
(By the way -- this is a remarkably effective way of dealing with drunk folks.)
They all giggled for a while before a silence befell them and one of them stared at me and said "I LIKE YOU!"
At length, they turned away, proceeding higher up in the garage and returning to their worship of the patron saint of sober drunks. I opened the trunk and got about the business of carrying all that stuff out.