Wow I took the title of this thread literally, i.e. things as in actual objects.
It happens to me repeatedly, usually at work. I go in one of the offices to see someone because I need to ask them a question. That person is talking non stop to someone else and I'm waiting awkwardly beside them to ask the question or whatever, it's not a meeting or anything, just a social conversation. This would last for 15 minutes, 20 minutes or even more. At least if I allowed it to anyway, because I just refuse to play the game that is being played with me, and so won't wait more than about a minute and a half, else I just go off and do something else. I don't care if it's an important question that remains unanswered, not looking awkward and not looking like a dork are more important to me. Of course I could interrupt, it would be the only other way, but it would be considered/called out as rude and plus, all this time there literally is absolutely no space in the conversation to get a word in.