Both of these rules allow a simple majority of either chamber to force a bill out of committee and bypass the standard procedure.

Rule 42 - Senate

Rule 42 states that if a simple majority of senators (26) sign a petition, a bill can be brought out of committee.

Rule 60 - House

Rule 60 state that if a simple majority of representatives (51) vote on a motion made on the floor, a bill can be brought out of committee. This was attempted by Christopher Rants on 3/4/08 and failed 46/50. View the tally here.