I had someone use my email address to get the confirmation for the out and return flights for himself and his partner.
I have a gmail address, which I got back in the time when it was still invitation only, which I set up as my initial and last name @gmail.com. This person with the same initial (but different first name) and same last name decided that my email address must be his, so he used it when booking his tickets. Normally I just delete these emails, as this guy was the 4th person who has made the same mistake, but as they were for flights, I decided to be kind and contacted him - he was easy to find, as I had the city where he lived.
I can't believe how stupid some people are.
For a short period of time, I was thinking of where I could send him, maybe change his return flight to Juneau Alaska and see if he noticed.