Hit the purest 7 iron of my life today and can't repeat it

[RoughRider_Rick]

Was at the range after work, just working through a medium bucket and not thinking about much. Then around ball 25 I hit a 7 iron that felt like absolutely nothing. Ball just launched, tiny divot, dead straight, probably 15 yards past my normal 7.

Of course I spent the next 20 balls trying to feel whatever that was. Chunked 6 of them. Skulled one into the netting. Classic.

Here's the thing though, I have no clue what I did different. Same setup, same grip, same everything as far as I can tell. Or maybe I was just relaxed for one swing and then immediately tensed up trying to chase it.

Anyone else ever have a random pure one like that? Were you able to figure out what it actually was, or did you just spend the rest of the bucket chasing a ghost like I did?