This is the sort of card I would send to closer work friends upon finding out they are leaving me with a bunch of people that don't really get my warped sense of humour. I mean, yeah, I'm happy you've got a new job, but really, you're leaving me here? Alone?
 
If you can't imagine your working life without a certain someone, the 'Congratulations! Your happiness and success disgust me.' card could be just the thing!