No, never, but that's mainly because I
know that that's something that
nobody can
feel, however much they
imagine that they can.
Anybody who can
sense being stalked will look in the direction of a stalker. It takes a conscious, deliberate effort
not to do so (i.e. in order to fool the stalker by giving him/her/it the impression that the prey/stalkee is unaware of being stalked). But, of course, your "
sense" means sense
telepathically, and that
never happens!
Probably not. It would depend on the time lapse: If on average people tend to cast a glance over their shoulder once every ten minutes or so, thus discovering that somebody is watching them, then of course test situations that lasted more than ten minutes would, on average, produce the result you claim: more often than not! Tests that lasted fewer than ten minutes would, on average, not.
Yes, that's one of the many reasons why animals have eyes, ears, noses and other senses (for instance of vibrations or electrical fields)!
However, even though a pig would be much more likely to escape a predator if it had wings and were able to take to the air, that still doesn't mean that pigs can fly!
You would stand a better chance if you go for the
Pigasus Award (Wikipedia).