Huge tomatoes this year

One year, before we moved out here, I had a great crop of better boys. I like those because that's what my grandfather grew in his garden and they are very good. After that growing season was over, come the next spring, I did not plant another garden, because we knew we'd be moving at following summer. Anyway, shortly before we moved, I happened to check where the garden was the year before, and lo and behold, there were ALL my better boy plants AGAIN! I have never in my life seen tomato plants come back a following year, but those did. Dangdest thing I ever saw.