Professor Claus

We have a real Scrooge in our research group. He hates Christmas with a passion (or so he claims). To try to get him into the spirit of the season, every year a bunch of us get together and decorate his office while he's lecturing. I'm sure he appreciates it really...

The best part is he has to give undergraduates their tutorials in here later today :)

Edit to add: my spies tell me that when he returned to his office to see this glorious grotto, his precise reaction was to shout “Oh for God’s sake! Hell fire and damnation!!” And then when he'd sat down “they’ve even done my muuug!!”