The star revealed that he had an embarrassing trip to A And E after splitting his foot open in the accident.
Dec, 34, told OK! magazine: "They are very heavy - I dropped one on my foot once, split it open and had to go to hospital.
Co-presenter Ant McPartlin added: "That was an interesting trip to A And E!"
Ant and Dec, who scooped two gongs - Most Popular Entertainment Presenters and Best Entertainment Show - at last week's National Television Awards have to fight over their joint awards.
Ant, also 34, said: "If we win Best Presenter they give us two gongs so that's quite good, but if one of our shows wins we have to fight over it."
The pair, who scooped their ninth National Television Award for best presenter and took home the entertainment show prize for Saturday Night Takeaway, are filming the next series of Britain's Got Talent with Simon Cowell.
Dec said of the new series: "We found a couple of interesting characters. Not the next Susan Boyle as such. But I don't think the winner next year will be like Susan Boyle. I think it will be somebody completely different that none of us will expect."