I love these...
Back in '95 I received an automatically generated summons for non-payment of Council Tax from Derbyshire County Council (or whatever it and they were called at the time). It clearly stated that I owed them something like -0.23 pounds. Yes, I'd mis-read the amount due and over paid them by 23 pence. Their badly-written Council Tax system had then duly hit a dealine and churned out who knows how many summons for anyone who had a non-zero balance.
The person who answered the phone when I rang up to say "WTF?" sounded extremely bored with the whole thing. There must have been thousands of us.