It's only from reading posts like this in the past that I avoided making the same mistake.
Even now, I have to check several times that I haven't accidently ordered five kilos of bananas when I only want five bananas!
(This reminds me of shopping in Spain many years ago and asking for a quarter of a kilo of mushrooms, then waiting patiently while the assistant went away, came back with loads of bags and proceeded to fill them with four kilos ...! In fact, I know someone who had a very similar incident in France, only their mix-up involved those quantities of very expensive prime beef that she wanted mincing!)