Accenture and Infosys
About monthly, the supermarket's tech leads, myself, a project manager working with me, and anywhere up to about ten Infosys employees would meet up physically in the supermarket's offices. Only one of the Infosys employees would ever address the table, and rarely at that. The others all had identical laptops (perhaps even identical clothes?), and all took notes during the meeting, but never spoke, apart from just occasionally to mutter quietly to each other.
It was absolutely surreal. Needless to say, the integration did not go especially smoothly.