"Citronen är sur."

Translation: The lemon is sour.

[NathanHill16]

I entered "The lemon is grumpy" on a lark, and got what I deserved.

[lostdrewid]

I would give you a lingot for taking one for the team, but mobile doesn't let you give lingots >.<

[olenoble]

Tried it as well just to give it a shot.
That said, despite the fact that it is quite non-sense, it is not grammatically incorrect and I'm not sure it should be counted as wrong. Can't we imagine some fairy tale story with fruits being characters ? (In which case the sentence could work out)?

[moerkoet]

I gave both of you a lingot! Tried the same thing just to be funny, but to no success :D

[mutterholle]

Can we use "sur" to describe a person who is kinda resentful like in German "Er ist sauer"?