Professors have the coolest job. They get to pass on knowledge to students that will eventually make some huge difference in the world, they get to intimidate people whenever they want, they’re respected (or feared)…
…and they get to make you look pretty dumb in front of everyone. Sometimes even without meaning to.
You raise your hand to ask a question, and the professor doesn’t notice, but everyone else does.. so you’re stuck in this awkward position and must decide how to continue: Will you keep your hand up until he notices? Will you bring it back down?
As awesome as it sounds to say that you would speak up, you usually don’t, admit it. You just sit there with your hand up, and start to wonder how you must look like to everyone else.