I only get frustrated when someone refuses to accept an undisputed fact as truth. Like one time, a girl asked me how to spell "congratulations". She kept insisting it was spelled with a "d" instead of a "t". I kept telling her, it has a "t". She would not believe me, and too bad, I couldn't find a dictionary, at the time. Finally, she asked a guy how to spell it, and he said "t". Of course, she believed him right away, because she had a crush on him, lol.
Other than that, stupid questions don't bother me. You can't know everything. There's lots of things I don't know, either. I don't mind explaining things, if the person is open to what I have to say. If they are not open to answers, then they shouldn't be asking questions, IMO. Like that girl who asked me how to spell congratulations.
A black cat crossing your path signifies that the animal is going somewhere.