The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
The closest I can think of is The Cloud Cuckoolander Was Right.
Not what I want- the character is not a cloudcuckoolander...bump. If not I'll YKTTW it.
"You want to see how a human dies? At ramming speed." - Emily Wong.
Obfuscating Insanity is the closest I can find.
Yeah that's what I looked up first, but its almost the opposite of the situation I'm thinking of- Obfuscating Insanity has character pretending or playing up the crazy for their own reasons. Whereas the situation I have is a character acting normal but being thought of as crazy in-universe for whatever reason.
"You want to see how a human dies? At ramming speed." - Emily Wong.
Are you sure it isn't a Tomato in the Mirror?
"Show us the Galaxy Warp."
Huh? Nope. The character IS sane, but just thought of in universe as crazy. Sarah Connor at the start of Terminator 2 is another example.
"You want to see how a human dies? At ramming speed." - Emily Wong.
Maybe You Have to Believe Me! (where a sane character warns of danger so incoherently he/she sounds crazy)
Yep that comes the closest, though I'm not sure its quite what the examples I have in mind are...
"You want to see how a human dies? At ramming speed." - Emily Wong.
When a character is thought to be crazy in-universe but the readers/viewers know her to be sane. Specifically thinking of Cordelia Vorkosigan prior to her escape from Beta. Mistaken For Crazy?