Buyer submitted a "best offer" on eBay that was obviously a typo (offer price was way higher than Buy it now price). The buyer quickly sent us an email not to accept the offer as it was a mistake. We declined the offer per their wishes. Later, they bought and *paid* several units of the product from us via "Buy it now."

The day after we shipped the product they sent us an angry email stating they were going to report us to eBay because they asked us to cancel the order and we didn't.