Oh yes, he does get into these moods-funny moods-every now and then, after which things go back to normal.Just as a friend and outside observer, I'd say that Oli goes through these cycles. He has done this before and each time he ends up just fine.
There is really no typical behavior for all tortoises and it sounds like Oli is being himself.
Avoid grapes.
I have never fed Oli grapes.