Everyone once in a while some new stupid idea comes along that we legitimately have never seen before. It's a new and fun occurrence - the first time.
Opening some guy's unsolicited three chapters (not the end of the world), I read the query, which began with, "I had the pleasure of meeting you at the _____ Conference." In fact, it was the same conference name that had been written on the envelope, which I had ignored.
Now having just completed going over all of my boss' expenses for the last year to enter them for tax purposes, I think I can safely say what business-related trips she has taken, because she kept the receipts. I turned to her and said, "Did you attend ____ Conference?"
"Oh, no. I was on the list, but I cancelled way in advance."
Clearly the guy had just gone down the list of names of all of the agents supposedly attending the conference and hit them all up with queries, hoping it would be an "in." Well, it is an "in" even if we don't remember you, provided we did actually attend the conference and did actually meet a ton of people we wouldn't remember. So, be more careful like that, or end up looking like a jackass.