Joan, Bumpo, and Dave see Frank working on his car in a greasy t-shirt, muscles on display, and wonder what he does. Their first guess is that he's an artist.
When the Cold-Blooded Torture of Mickey Duka is revealed to be a farce to scare him into talking. Frank has the man hanging upside-down from the ceiling as he lights up a blowtorch and describes in great detail what will happen to him as the superheated flame touches his body: he'll smell burning meat and won't feel pain, at first, but rather a terribly cold sensation as the nerves die. He then walks behind the mook, roasts a steak with the blowtorch, and begins jabbing him in the back with a popsicle. And when he finishes, he puts the popsicle in Mickey's mouth.
Frank gets conned into a group meal with Joan and Bumpo by Dave. Cut to him wolfing down his food in awkward silence until he realizes everyone's staring at him, and sheepishly wipes his mouth with his napkin.
Howard: You know, Jim Bowie, the colonel... the man who died in The Alamo... had a knife named after him. He was a gambler. And when he was accused of cheating at cards, what he would do is take the guy in the other room, move the furniture like so... then he'd take his knife, he'd throw it in the ground... and the one that left... got the money.
Frank's fight with the Russian, with "La Donna E Mobile" playing throughout it all (intercut with Bumpo and Dave goofing off to the song while the former makes dessert, eventually getting Joan to dance to it), and the Russian himself turning many of Frank's countermeasures on their heads.
Every one of Frank's stunned reactions when he realizes the Russian can either tolerate knife wounds or outsmart every trick Frank knows. Special mention to when he pulls a hidden Hand Cannon from a desk, only to have the Russian pin his wrist down and slam a 40-pound dumbbell on the gun's barrel, smashing it flat. Frank's reaction here is less "Oh, Crap!" than it is "Dude, fucking seriously?"
At the end of it, Frank turns to his housemates and goes "I'm fine. He's not." Before keeling over, unconscious. They drag him upstairs to patch him up, and while Joan looks for medical supplies and Bumpo surveys the destruction, Frank grabs a bottle of Wild Turkey out of Dave's hand (leaving the cork behind) and chugs half the bottle.
Dave: [As Joan starts stitching up a knife wound] He looks weak. Is he gonna die? [Frank yelps and grabs Dave by the wrist, sending him to the floor in pain] Appearances aren't everything! You can let go now!