I'm no good player, but when things aren't going right and every chord sounds wrong I get very, very frustrated.
It very rarely lasts for the whole day though, because I can't relax, I try to do something else and my mind is just going "Why am I suddenly a clown on the guitar?" and before I know it it's back in my hands, I'm messing with the tuning and what not and more often than not I get back in some kind of "groove", so at least I can sleep easy that day
