V:tM game I was in. We had some weirdass shit, like my poorly played Malkavian, a Toreador raver and DJ, a Tremere who never showed, and another Tremere who backstabbed his family of Hermetic sorcerors by giving their secrets to vampires.
But the best incident involved our Nosferatu, who was a douchebag (in character, not the player himself) that enjoyed playing pranks on people, and our Ventrue, who had 5 Resources and 5 Fame by this point.
The Nosferatu decides that in order to work on his Potence to justify taking another dot when he had the XP, he wanted to go get a side of beef to punch. And to feed to his ghouled attack dog. So he used Obfuscate to go invisible and hiked over to the slaughterhouse district.
I'll note that the Ventrue's player wasn't supposed to be showing up this session.
So, when the Nossie walks into the slaughterhouse, he uses Obfuscation to make himself look like the Ventrue. Then he purchases the side of beef with money he'd previously "acquired" from said Ventrue. And he decides to walk back home carrying the side of beef over his shoulder.
He wasn't an idiot, mind. He did make sure to reapply the invisibility before he started his hike. Except he botched the roll to activate the invisibility. He did NOT, however, fuck up on a roll to maintain the disguise as the Ventrue PC. So in-character, he thought he was invisible until he got back to the haven and one of the other PCs spotted him before he tried to deactivate the invisibility.
It was at about this point that the guy playing the Ventrue called to say that he was going to be showing up after all. When he arrived, the first thing his character got when he woke up the next night in-game was a tabloid (it was set in London) with a front page picture of himself carrying a side of beef through the streets. And none of us told the player what was going on until he figured it out in character. It was amazing.