Public transit is wonderful. It usually costs less than owning a car, offers frequent service (most of the time) and allows you to get home safe when you're drunk. But its benefits mean it attracts people in all moods, at all stages of their day, people who often seem to forget that they're still in public.
So here is a short list of some of these passengers, many of whom we can probably all see in ourselves at one time or another.
Do you have any pet peeves that we didn't list? Tell us in the comments below.