Brain injuries can cause both profound and/or subtle changes in people. It has been reported that some have even changed their voice and started speaking with an American accent! That could potentially be a source of humor or even a source of humour...
In all seriousness, small steps and best wishes.
I was hoping that all the latent Finnish I have learned would surface and I would be fluent. No luck.
On a side note: Speaking with an American accent generates fat.
Cheers :)