From Jayski.com:

Hamlin Tripped Up After Lowe's Testing UPDATE is OK: Frontstretch.com is reporting: Through two days of testing at Lowe’s Motor Speedway, there were several wrecks but no major injuries…on the track. Off the track, it was a different story as teams packed up to head home Wednesday night. The #11 FedEx team with driver Denny Hamlin found themselves goofing around and doing a little personal testing of their own after on-track activities were completed at 9:00pm/et. Members of the crew found themselves being timed as they ran laps around the team’s hauler. Unfortunately, the horseplay led to a minor mishap, as driver Denny Hamlin tripped and was injured during all the fun. Hamlin was loaded into an ambulance and taken from the track as a precaution. The nature of his injuries are unclear at this time.(Frontstretch.com)
UPDATE: Joe Gibbs Racing driver Denny Hamlin injured his left hand in an off-track accident last night following the conclusion of testing at Lowe's Motor Speedway in Concord, NC. The driver of the #20 Rockwell Automation Chevy in the Busch Series and the #11 FedEx Chevy in the Nextel Cup Series cut his left hand between his pinkie and his wrist. He was taken from the track via ambulance and was treated at a local hospital where he received stitches. Hamlin is expected to participate in all of this weekend's racing activities at Richmond based upon the evaluations of Joe Gibbs Racing's team physicians. The following is a statement from Hamlin regarding the accident: The guys were having races around the hauler after the test. I thought I'd try for the best lap of the night, and as I was running around the front of the truck, I caught my hand on a sharp piece of chrome. I got all stitched up and I'll be fine to race this weekend. By the way, I did finish first. Hopefully Coach Gibbs will be impressed that I can play 'hurt'."(Joe Gibbs Racing/True Speed Cummunications PR)(5-4-2006)