But the entirety of language is just words that someone made up. If you recognize a set of syllables as a word that has a specific meaning, then it's a word you understand, even if it was just made up and taught to you seconds ago.
Signtist
One time my friends and I needed an NPC to empty his bag of holding, since it was magically locked so only he could open it, so we told him "Did you know the word 'squanch' means 'empty your bag of holding?' No, well, now you do." and then used Command and said "Squanch!"
I always thought the spiked bat guy was supposed to be threatening the regular bat guy. Hopefully in this version of the meme he's just waiting in line to threaten the pompadour guy.
Yeah, after they stick them with banderillas to scare and anger them into aggression. Without all the prep work to weaken and anger the bull, the cape wouldn't provoke it at all.
Funny that you use those examples, since they're both wrong. If anything, we should be running at the trolls with stinky socks because someone wanted to sound smart at a bar once and made up a factoid that spread like wildfire among the common folk.
Eh, I know nothing about how to handle most dangerous animals, even ones that live in my area; I'd imagine that even in a world with trolls, regular people wouldn't know anything about them.
If your character is a seasoned adventurer or monster enthusiast, sure, light it up, but if your backstory places you as the village baker for most of your life, running in with alchemist's fire at the ready seems a bit strange.
Ultimately I'd consider it to be on the GM's shoulders - if the only way your group is going to survive the troll encounter is with fire, then put an NPC in the local tavern who warms newcomers of a troll in the area, recommending that they have a lit torch at the ready.
The players should never have long-term friction; the characters can have all the friction they want so long as the players are all getting along out of the game.