what are some things you used to think were vegan, but aren't?

So I've been vegan for several years now, not only in my diet but also in my lifestyle, cosmetics, clothing etc. and it feels great!

But I still sometimes come across things I thought were vegan, but aren't. I know about all the E numbers, but recently I found out that using the Eiffel Tower's elevator is basically non-vegan because it uses grease made from pig fat (literally!).

So I'm curious about some other things that you used to think were vegan, but aren't. I'm sure there are a ton of things out there I haven't heard about yet.

Thanks ahead!