Earlier quoted context omitted.
Also popular are ready meals and squashed-sponge pre-sliced 'bread' that takes a year to mould.
If you want bread that molds readily, try getting some Francesi rolls. I've had those mold on the way home from the store. (Some people might argue that that was just bread that was already moldy in the store. Perhaps, but Francesi rolls really will mold within a day or two of purchase.)
They can sense you've bought them..