Here is another possible scenario... Ruder pedal jam. Unlikely? maybe not, Boeing know about it.
737NG-FTD-25-15004
Rudder Pedal Motion Restricted
Background
An operator reported that a Rejected Take Off (RTO) was performed at 25 knots after pilot experienced stuck rudder pedals. The airplane returned to the gate safely and the flight crew reported no rudder pedal anomalies prior to takeoff roll. Maintenance found a loose flush-head fastener protruding/interfering with the rudder pedal movement (captains rudder pedal housing, left foot - inboard side). Maintenance subsequently re-torqued the fastener, performed a rudder pedal adjustment and limit test with no findings. A Boeing review of Flight Data Recorder (FDR) data confirmed the following: Right rudder pedal motion was restricted to approximately 3 degrees, Left rudder pedal motion was not restricted and Centering capability was not restricted. See the attached Illustrations for additional information.