The UKTV survey on the best comic one-liners has trawled up some great stuff (see here).
I particularly like the acidity of Mrs Merton's question to Debbie McGee.
Still, there's a gem that didn't make the list, from Ali Gee's interview with Victoria Beckham:
"When Brooklyn grows up would you like him to be a footballer like his dad, or a singer like Mariah Carey?"

