Recently I got an email receipt for event tickets that I didn't purchase. Looking at my credit card showed no transaction, so it was probably just a case of someone entering the wrong email address while checking out. The receipt happened to include a phone number, and I was about to text this person to tell them about the mistake when I realized that this would be a great way to insidiously associate an email address with a phone number. The iMessage hacks demonstrate that this would be a great vector for someone in possession of some 0days.

Realistically, was I being targeted? No. But it's a sad state of affairs that I have to even think about such things. I ended up looking up the company online and finding their contact email address to let them know about the mistake, so they could contact the person directly (which they did, and thanked me).