What is David Walliams dying to know about Simon Cowell | Semi-Final 3 | Britain's Got Talent 2013

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What is David Walliams dying to know about Simon Cowell | Semi-Final 3 | Britain's Got Talent 2013 with tags britain's got talent, britains got talent, britain's, got, talent, britains, bgt, 2013, ant and dec, ant, dec, simon cowell, david walliams, alesha dixon, amanda holden, simon cowell penis, david and simon, penis, david flirting, judges questions, simon cowells house, davids dreams

It's BGMT phone in time and for a change, the question is for David.

Can you guess what he'd like to know about his Simon?