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I have scored once by getting on my knees and heading a grounded ball across the line - George Best nearly did it in the European Cup Final he reckoned - but the goal was given. Where's the difference?
Oh, was I showing my age there? Damni seem to recall that you should be cautioned for that if you tried it these days, Matty, for unsporting behaviour

OK, I follow as has been said earlier - USB.The difference is intent. If a player has control of the ball and then gets down on the ground to head into the goal, then it might be silly, and some might make the argument for it being unsporting if it is just to show off how much time he has, but it is not a deliberate trick intended to circumvent the spirit or letter of the law. There is no benefit he is seeking to gain from the absurd action.
If this happens at the other end of the field, back to the keeper, I just don't see how that can be anything other than a deliberate trick to circumvent the law. You may disagree, but in my mind it meets exactly the same criteria as flicking the ball up in the air to head it. Not an illegal action anywhere else on the pitch, but clearly a player going out of his way to head the ball when the only advantage to be gained from doing so is the keeper being able to pick the ball up. In my opinion the same would apply if a player intentionally used his knee to nudge a ball that was on the ground.