The demonstrator couldn't figure out why the machine wouldn't work, until he remembered that there was an interlock so it wouldn't operate with the cover open.

Sorry, have to come out of my state of lurkership to respond, completely off-topic, and say as far as I know it's actually only America (maybe Canada?) that has a silent 'h' in herbs.

It took quite some time to collect enough wooden nickels to equal anything of value. And what many customers didn't realize was that everything in the wooden nickel stores was priced higher than anywhere else.

Forthermar o þis lecheri / Agh i þe noght to specifie[…] I will not speak explicitly about this lechery any further.