I don't think it happens too often. Once is a mistake, twice is an attack.

(I must admit, in a moment of weakness, I've hit into the group ahead intentionally - only to find out they were waiting for a slow foursome. I apologized, and bought beers when we were done).

The only other time I hit into a group, I did so unknowingly.

It was dark, a par 3 (~200 yds and elevated tee) and I could only make out the guy who checks for 'closest to the pin' (it was our mens' night). I knew I was the last guy, and waaay behind the last group (or so I thought).

Anyway, I tee up and let 'er fly. Great shot, found the green. All of a sudden, there's yelling like crazy coming from the green. Turns out the guy I could see was one of the foursome. There were 2 guys at the front that I couldn't see (missed one guy by 1'), and another behind the green (hill green). Needless to say, I apologized profusely and bought beers.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.