How do you know it's not just "wind" from a collection of bodily...

How do you know it's not just "wind" from a collection of bodily orifices?

By that I mean chartists look at someone buying, and because they're buying (for whatever reason) then someone else thinks they should buy. So on and so forth, and before people realise it, the stock comes down crashing to the original price. Pity that no one blows a whistle at the top!

As for "momentum" investing - what a misnomer. That type of rally, which has no fundamental basis, by definition has no weight. No weight means no mass.

But momentum is velocity x mass. No mass means no momentum. Therefore that behaviour cannot be called momentum investing.