It always had me tossed why in the 737 Classics, Boeing switched the autothrottle switch to ARM before starting the engines. Previously, the autothrottle was switched to ARM only when lined up for takeoff. This was a precaution against an inadvertent touching of the a TOGA switch while taxiing which could prove disastrous on the tarmac or taxiing behind another aircraft. . A wise flight safety precaution one would have thought?