Not to beat a dead horse, but I've come across everything above, except for "yes." The best thing you can do when prompting is to spot memorize and follow along with your finger because it is best to watch the actor's body language. I've worked with one union actor on a number of occasions, and even though he may have been 3' away from me, and called "Line?!" he will yell it at me several times, no matter how loudly or clearly I give him the line, repeating the same "Line?! What? Line!!!" as if I had been whispering or not speaking at all. I've come to learn that it's nothing personal and you just have to learn to roll and adapt to each actor's style.
The other thing is the silent call for line. Those can be the most difficult. There are a great many out there that won't call at all, and may not even look at you, but will gesture towards you - if you're lucky. This is why spot memorizing and watching the actors are so important. I have one that does a small gesture of his hand, and it has to be coupled with a certain look on his face - never to be mistaken for him emoting - then I give him the line. It's important to remember that it has nothing to do with you, and only with their personal frustration for not being completely off book that causes these strange reactions and outbursts. I've always worked with my interns about how to properly project, not to speak into their scripts, and how to study the actors to learn their habits. Being on book and giving lines correctly and clearly can be one of the most important aspects to the SM/Actor relationship.