Around 44 BC, Roman senators began to fear Caesar's growing power in the senate following his appointment as Dictator for Life.
A group of "Liberators" met in secret to find a way to over-throw him. They all agreed to hide daggers beneath their togas during the upcoming senate meeting.
The following day, Caesar was asked to attend a meeting where the Senators would read a petition asking him to hand power back over to the Senate. The petition, of course, was a fake and never existed.
While on-route to the senate flour, Caesar was redirected to another room where he was killed -- the unforeseen result was the eventual fall of the Roman Republic.
For Caesars' sake (and for Rome alike), it should have been a conference call.