In the 90s we used to get milk delivered - I remember as a kid skimming off all the cream from a new bottle into a glass then filling it up with the existing open bottle... never got caught out by my mum!
We also had the issue of it being stolen off the front step - my mum asked for it to be put in a gas meter cupboard. This worked out well. However when we moved out a few years later my mum asked me to read the electricity meter - I then found 2 very old crusty mouldy separated bottles of goop in there that had been there from years ago. I just left them there and read the meter as requested, no idea what happened after that, was too busy loading boxes into our Fiat Panda!