"you can use it as long as you don't break it"

I recently asked a friend to borrow something of hers and got a reply of "as long as you don't break it" this got me thinking about how annoying this saying is and how inappropriate it is, as

why would i break it?

Unless i was to physically throw it or stamp of it then its pretty much impossible to break a product when following the correct instructions on how to use it. Once somebody has said this to you it puts more pressure on you and you feel more nervous when using their product making you more likely to make a mistake and break it. There is also as much chance of them breaking it themselves as there is for me to break it so why bother saying it.