The one that I hate the most goes like this:
"I can assure you that this is not a marketing call, we are just conducting a survey for the free installation of windows, conservatorys, porches"
"Mmm"
"If you could have any number of DG windows installed, free of charge, how many would that be?"
"None, they've all just been done"
"How about a conservatory, if you could have one free of charge, how big would you like it to be?"
"Tiny, we've just had a massive one installed"
"Porches, if you could.."
Slams phone down and runs to crying baby.