It seems as though every business is jumping on the guarantee bandwagon these days, last night I saw a McDonalds television advert proclaiming that if your fries aren’t hot at the counter, they will replace them… guaranteed.
To me that says “Up until now it has been ok to give you fries that weren’t hot, but now we guarantee it :D”. Seeing as the actual title of the product is ‘Hot Fries’, how can you guarantee in the voluntary sense or the word, that they’ll be hot? If they’re not hot, you don’t actually have a choice about replacing them. You just have to because that is what you said they were in the first place…sheesh.
The Consumer Guarantees Act states quite clearly that goods must match their description. In this case, we’re selling ‘Hot Fries’, the name of the product on the menu boards. So, by law, they must be hot.
Maybe I’ll start guaranteeing stuff I’m required to do so under law as well…
“We guarantee we won’t punch you when dealing with us” 
“We guarantee we won’t steal your car”
