When I bought my curent house the person I purchased it off left a massive roll of clingfilm.
It isn't in a box with a serrated edge, it just magically tears off, and never sticks to itself where it isn't supposed to.
I'll really miss it when it eventually runs out, and will probably move house in the hope of finding another.
My pet hate are plastic food containers, the ones that are supposed to have a corner that peels back, and never does, and instead you have to attack with a knife to retrieve the boiled ham, or whatever.