Alfonso Smith, the self-proclaimed fastest senior in college football, backs down from no challenges. He only makes them.The speedy senior tailback wants to once again prove he’s not only the fastest tailback in Kentucky or the Southeastern Conference – he wants to prove he’s the quickest senior in the nation.Smith, who will face tailback C.J. Spiller and the Clemson Tigers in the Gaylord Hotels Music City Bowl on Dec. 27, has issued a one-on-one 40-yard dash challenge with Spiller … sort of.”I’ve got something to prove,” Smith said. “I hope we can do it in (bowl) practice (in Nashville, Tenn.). He can come running over. The cameras could be there. Everybody could see this. Scouts, everybody.”Smith is neither short on confidence or humor, so it was hard to tell if he was openly issuing Spiller, one of the speediest players in the nation and a dark horse Heisman Trophy candidate at one time, or just joking around. However, when it comes to his speed and 40-yard dash time, Smith rarely kids.Which brings us to how this challenge came about in the first place.To hear Smith tell it, he actually clocked the fastest 40 time during offseason workouts, but the times “somehow’ got switched. That meant Spiller was the faster senior tailback in the nation – not Smith. “Somehow my 40 time got switched with his, so now his 40 time is faster than mine, and I’m disappointed in that,” Smith said. “I feel like we have to go out on the field and prove something now.”Smith’s sister actually discovered the snafu on a scouting Web site. She e-mailed the Web site and pointed out the mistake, but Smith said she never heard back from them.His original 40 time, Smith claims, is a 4.31.”I got a 4.4. I don’t run no 4.4,” Smith said. “That’s an insult.”So how exactly can something like that get switched?”I don’t know. Politics, man, politics,” Smith said. “I don’t how understand how you can switch 40 times like that. It’s like did you mess up? Come on.”I think Smith was joking. Then again, it’s never easy to tell with him.One thing I do know: I’d pay to see Smith and Spiller race. Heck, throw Derrick Locke into the challenge while we’re at it.