At a previous company, we had a culture of sending out prank emails from open machines.
I once sent out an email from a co-founders account which said that he was fed up with the crappy codebase and was hiring a new team to rewrite it from scratch and that the other (non-tech) co-founder was to take over the existing tech team. No one took it seriously (non-tech co-founder helped me draft the email, the other one laughed while reading it after the fact), but there was a board member in the mailing group who thought it was serious and started sending panicky emails to the co-founders.
I once sent out an email from a co-founders account which said that he was fed up with the crappy codebase and was hiring a new team to rewrite it from scratch and that the other (non-tech) co-founder was to take over the existing tech team. No one took it seriously (non-tech co-founder helped me draft the email, the other one laughed while reading it after the fact), but there was a board member in the mailing group who thought it was serious and started sending panicky emails to the co-founders.