Si & Gary: Si reveals one of his biggest life regrets, it involves nudity and his imaginary friend

During a conversation about the one thing you regret doing in your life, Si dropped this bombshell.
He reckons that he and 'David Fendall' (his imaginary friend who he insists is real despite being incredibly hard to get a hold of), used to dare each other to run across the streets naked...
Watch Si try to talk his way out of this one in the video above.