I worked at Tesco, a UK grocery chain, in my teens. I was involved with stock control, among other things, and was partially responsible for populating shelves at a new store.

All products at Tesco have an 8-digit product number (SKU) in addition to the EAN/UPC. There's also a three digit case size number. Like this:

05123456-024

Each product has an estikmated weekly sale and a capacity (shelf plus warehouse) to aid efficient warehousing. Each product has a case size of less than 1,000. Well, all but one -- white sugar. That has a case size of 1,024. It's annotated on the shelf ticket as '024', dropping the leading '1'.

I didn't know about this until ~43 tonnes of sugar arrived on 6 trucks the following day. For a new store. In a small town.

It turns out that me misreading '024' as a case size and over-ordering sugar by a factor of 43x was enough to have the internal ordering software updated.