Very funny concept! This is definitely top 3 of the competition for me, so far. I'm inclined to say that the text on each sign should be hand done in different handwriting. I think it would add a nice touch to the illustration. Nice work. Good luck!
Fun idea, but really needs some variation in the signs being shown, as well as maybe more clearing up of the concept with some office drones trying to get to work and be productive but maybe cutting themselves and stabbing themselves in the eyes and stuff because their brains aren't working correctly without some coffee influx.
About my design
Thanks to Ninth Wheel for the template.