I was calling CQ on a beam pointed towards the USA on the 10m band yesterday and heard a very faint voice right in the back of the box returning to my call. I strained my ears and after about a minute, I had the callsign in the log. It was QRP station WA2GSX/QRP. He was running 100mW from the State of New York.
Contacts don’t come much more rewarding than that.