How is that Biologically Possible?: Lessons in Grammar

A little while ago, John Boehner told the members of the Senate to "get off their ass" and pass something on sequestration.

Apparently, there is one single "ass" shared by the 100 members of the Senate and upon which all are sitting.  That seems biologically aberrant and physically uncomfortable.  If 100 people had only one gluteus maximus among them, then I think that medical help, not delaying sequestration, should be their first order of business.

While Boehner has some grammar lessons, maybe he and his fellow Republicans could take some math lessons, too, and I'm not just talking about the budget.