The Hitler Rants videos on YouTube normally sees either Fegelein or Himmler (or often both) pulling antics on Hitler. Once the spin-off series based around Joseph Stalin and the cast of Das Boot got their own antic masters, Fegelein frequently had to explain to Hitler's staff that he wasn't involved in whatever embarassment had just befallen Hitler, often with little success.
In the version of Hellsing Ultimate Abridged by Team Four Star, Alucard is a JerkassSociopathic HeroBlood Knight who is basically the logical result of what would happen if you gave the biggest Troll on the Internet unstoppable superpowers. So when he's involved in an incident with the police in Brazil, Integra's first assumption is that he caused it and she calls bullshit when Alucard protests that he was just minding his own business until the police attacked his room. Alucard is just being honest, though—he hadn't done anything (yet) and the police were being used as pawns by a minion of one of the Quirky Miniboss Squad
In 'The Camping Webisode' of DSBT InsaniT, Koden tells Alex and Seth not to beat up Andy for Frets, Martha asks 'why', and Koden, knowing Alex is the one to say stuff like that, does a Double Take when he realizes it didn't come from him for once.
In one Global Guardians story set during the 9/11 attacks, Achilles immediately contacts his father, the Evil Overlord known as Lord Doom. The first word's out of Doom's mouth are "Don't even think of accusing me or anyone who works for me of committing such a vile and cowardly act," before Achilles can say anything to the man.
Gaea, a known Manipulative Bastard, has a video that is very copromising for her faction's top player end up on her blog. It took a solid alibi to convince her own Guild Master that she had gotten framed.
The actual poster of the video later got this, mostly due to happening to be in the same faction as the female player that had just broken one of the male protagonist's heart. On a side note, part of the audience was suspecting said female player to be working for him all along up to that point.
In Atop the Fourth Wall, both Linkara and the audience assume it was Mechakara who broke the Continuity Alarm. However, when he's finally confronted, he admits he didn't do it. As it turns out, it was Linksano who broke it.