Working support for 2nd worse UK computer builder, acting as Team Lead;
I once told an agent that the customer should get a a "...proper F***ing ISP", he then pointed out that he had a hot mic. We had to send a written apology.
In my defence it was AOL...
**We'd been back and forth with the customer, whose ISP insisted that the modem was at fault, despite us getting the customer to connect to at least one 'normal' ISP and our old BB (that we kept for this reason)**