We had a discussion about this about how often bomb threats get made to universities. I felt as if this was a rare thing, which is why, IMO, when it does happen

We had a discussion about this about how often bomb threats get made to universities. I felt as if this was a rare thing, which is why, IMO, when it does happen the news picks it up. However, my coworker thought that it does happen often, but is curious as to how they then distinguish between what might be legitimate and what they immediately think is a hoax. Then we both thought, if you do want to make a bomb threat, how do you decide who to call? Deans office? Football Coach? Ombudsman?