Can someone explain how i got this crit because i just can't seem to replicate it.
Was in Hexakill. Gangplank with 
End game under Highest Crit I'm showing 4064
Here's the match history http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1839427684/203907552?tab=stats
Decrous3 votesMy theory is that you used gangplanks Q on one of Heimerdingers Turrets.
The turrets take 40% extra damage from melee champion basic attacks. while deactived also take 200% damage (I think, not sure on exact number, but it seams like they are squishier while deactivated) + they are treated as minions so masteries that increase damage to minions would apply.
so just based on that. Sheen proc + crit for 250% from a parrrrly on a normal minion would do around 1300 (with that amount of damage), add 40% damage from being melee and you crit for 1820, and bonus damage if the turrets deactivated = around 3240 crit. Idk. I wish I knew the exact numbers but I don't. I think the turrets also lose their armor and magic resist while they are deactivated, so if they have 0 and then you have armor pen from the ghostblade and runes/masteries, then that may increase your damage even further.
Annnnnd, if you had the mastery that increases damage to units below 50% hp by a % and the turret was below 50% then thats more damage.
IGotScuttleCrabs1 votesForgot to add i was playing with full crit damage runes. So add another 46% crit damage brings it to 296%
What my guess is, that i crit someone with Parrly and the Hydra aoe spread it to other people? Im not 100% it can do that but I believe it can..
Decrous1 votesThe hydra damage wouldn't have counted towards the crit, but if you were with full crit damage runes then that would just make even more sense if it was on heimer turrets.
IGotScuttleCrabs1 votesCan you crit for more than somethings health though? Correct me if I'm wrong but i don't think even Heimers big turrets have nearly that much HP.
Angry Monster1 votesdamage has nothing to do with somethings health. Wards have 3 health slots of 1 and you get full life steal off them.
EndlessSorcerer1 votesYou can deal more damage than the target has health. It's not an issue.