I was farming Graveward offline and pleasantly surprised by an 8 legendaries drop! First time I have ever had such an amount of orange on my screen (while not being in slaughter) Normally I get around 2-3 on Mayhem 3. How about you, have you had an insane amount of legendaries drop from a boss?
Edit: it has come to my attention that some say that you get a better loot drop rate while playing offline, so I have to inform you that I did play offline when I got the 8 drops. I was playing offline as I did not want to get the annoying Terror affixes on the item drops. So, do take this into consideration when you post your answer:)