Re: Last time?
Apart from the times when the plebs actually have thrown out the elites. Then you have a bloodbath, possibly famine, and just end up with a new set of elites at the end of the process that are no better than the last lot.
I'm struggling to think of examples. In all the cases I can think of, one elite was thrown out by another. The Khmer Rouge were an intellectual elite. The Bolsheviks divided Russian Marxists by advocating an elite lead revolution rather than just encouraging the workers to rise up. The French Revolution was lead by an intellectual and nascent industrialist elite.
The only "pleb" lead revolutions I can think of are ones like the Paris Commune - which ended in bloodshed when it was suppressed, but was not founded or perpetuated by it.