These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Big Lipped Alligator Moment: During the Mobile Castle Infiltration Sequence, right before blowing it up, you find a small group of the robots dancing to a beatbox that is actually one of the Mobile Cover Robots. Before you have enough time to think about the robots you just killed, an Unknown shows up, and afterwards you go on to destroying the giant warhammer. Now this is a game that boarderlines science fiction and steampunk fantasy, but Russian Robots doing the Robot to American Music? COME ON.
Heck, the UNKNOWN in general. I mean, what was up with those? A heap of scrap armed with machineguns, with a glowing red core that grows legs and runs away sometimes? That's just weird.
Crazy Awesome: Hold down LB (360) or L2 (PS3). Yeah. That just happened.
The Romanov F has a flamethrower that will overheat your AR gauge (Where your Crazy Awesome powers come from in the first place). After that, he proceeds to smash you with his club. I bet you're thinking: "Oh I'll just go in critical mode and gain my health back". It's too bad he overheated your AR Gauge. Which pretty much makes his club a One hit kill attack.
Inferred Holocaust: There are no civilians to be seen anywhere in Providence. And if there were any survivors of the Russian assault, there likely aren't any left after the breach in the hull. And if anyone survived that, the nuclear destruction of the entire colony made sure no one made it out.
The default Romanov model has a teeth-grinding 'bloooork' sound every time it fires its ranged weapon. It fires its ranged weapons a lot.
Nightmare Fuel: When the microwave weapon is fired on San Fransisco, we get a graphic view of its effects, complete with full-body burns, boiling water, and exploding bodies.
Some of Sam's death animations, especially when killed by the Romanovs, are quite squick-worthy. There's the drill-equipped one, which grabs Sam, crushes him, and then slams his body into the ground and drills down through his chest and stomach....
The Unknown, if it kills Sam by grabbing him, will cut off his head and attach his body to the rest of it's parts.
Rated M for Money: Considering that all the Russian mooks are robots, it's safe to assume the cursing and bloody NPCs deaths were thrown in to increase the rating.
That One Boss: On God Hard difficulty, Bogeys Alpha and Bravo are nightmarishly difficult, and liable to induce a Rage Quit in all but the most insanely determined of gamers. According to the Xbox 360 leaderboards, less than 100 players in the world have actually beaten them on that difficulty setting.