To play the Joker in Suicide Squad, Oscar-winning actor Jared Leto pulled out all of the insane method acting techniques he could conjure. Everybody has heard of actors getting in deep in order to really deliver amazing performances, but usually that doesn't involve sending people used condoms or dead animals.
It was Sir Laurence Olivier who slyly critiqued Dustin Hoffman's method technique during the Marathon Man shoot, advising him, "Try acting, dear boy." Maybe this was Olivier making a witticism at Hoffman's expense but in the case of Jared Leto, it could be the central sentiment in his intervention. In playing the DC Comics villain, Leto has gone method in the most obnoxious way.
So lock your doors and get a restraining order, because these are the most annoying things Jared Leto has done as the Joker.