I'd like to say that he's happy and smiling, but I'd be lying. Another grumpy one.
This little bugger has a good reason-- he's lost most of his tail to a nasty case of tail rot in the last couple weeks.
He has surgery scheduled on Monday and I suspect he'll lose most of his tail. Hopefully once it's gone and he's feeling better, he will be more friendly.
The rot is unlike anything I've seen before. It doesn't look like a fungal infection, but it certainly is very aggressively killing off the healthy tissue. To be extra safe, he's in major quarantine away from everyone.