I’d noticed a change in the tenor of work but didn’t get confirmation as to the cause until recently:
Me: Hey
Coworker: Yeah?
Me: Is it just me or are there more well-dressed angry people walking around?
Coworker: Global Marketing got moved into our building and they miss their spacier cubicles.
Me: Ah, that would also explain the increase in the number of expensive yogurts in the fridge and the uptick in the number people buying chai from the cafeteria.
Coworker: Yes.  I think we should change the uniform of R&D to sweats and see if we can make them pop.