A Monty Python skit:
1: Hi, I’d like to get a date on this rock.
2: Ah, well, what fossils did you find near the rock?
1: Why do you need to know that?
2: So I can tell which results to use and which to throw out, of course! Wouldn’t want to wrong date back, now would you?
1: No, of course not. These were the fossils I found near this rock... but... I was really wanting to know how old the fossils are.
2: Oh, that’s easy, those fossils are 3 million years old.
1: But what about the rock?
2: Obviously, it’s 3 million years old, too, because it was near those fossils.
1: OK, thanks!
Yep!