On January 21, 2005, about 1100 eastern standard time, a Velocity XLRG, N121HS, registered to a private individual, experienced a loss of directional control during the landing roll and collided with a fence and ditch at Spruce Creek Airport, Daytona Beach, Florida. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 91 personal, local, flight from Spruce Creek Airport. The airplane was substantially damaged and the commercial-rated pilot, the sole occupant, was not injured. The flight originated about 0930, from Spruce Creek Airport. The pilot reported that during the landing roll on runway 23, he applied brakes to slow, but his left foot slipped off the brake while the right foot was still on the brake causing the airplane to veer right. He attempted to straighten out the plane by applying left rudder but was unable and the airplane traveled off the runway and collided with a fence and a ditch. He further stated at the time of the accident, the wind was from the south at about 5-10 knots, with wind gusts of 5-10 knots and light turbulence. No mechanical failure was reported by the pilot. The accident flight was the pilot's second flight test in the accident aircraft.