Oliver and Doors

Olivers diaper leaks almost every night - trust me, Oliver being the fourth kid, we have tried everything to prevent this and have now accepted it as a fact of life.  So now when I get him out of his crib I put him on the floor to walk downstairs for changing by himself.  For some reason, before he can go downstairs, he has to close all of the doors on the second floor.  he holds his sippy cup in one hand and closes all the doors with the other.