I found this amazing dinosaur tooth for sale on a well-known auction site. Except that, well, anyone can see that it's a damaged shark tooth.
Well, I couldn't resist. This was my correspondence with the seller. Bad spelling and grammar are his.
Me: This is a shark tooth, not a dinosaur tooth.
Seller: I was told it’s a Dinosaur tooth buy an expert if your saying it’s a Sharks tooth thats fine. I respect your opinion
Me: I'm afraid it's not my opinion, it's a fact. There isn't an expert in the world who would tell you that's a dinosaur tooth, so whoever told you that is not very knowledgeable.
Seller: That’s fine your entitled to share your own opinion.
I must say, I'm very glad that he respects my opinion. I put great stock in the value of my opinions. And whilst I know the 'expert' probably doesn't exist, I would dearly love to meet an expert who thought this was a dinosaur tooth, although my autonomic facial-slap reflex could very easily be triggered.