"Hello, sorry to pull you away from talking to your friend but I was thinking of buying this laptop. Trouble is I gather from Breaking Law that I only have 30 days for short-term rejection and after that I could be saddled with a replacement or repair. It might go wonky after the one month. I'll buy it though if you will agree to extend my time for short-term rejection to say three months and write on the till receipt or invoice that you do agree."
"I'll just get the manager, sir. And sorry to have kept you waiting but I haven't seen my friend for ages and she has just had a baby."