Third-person cinematic assassinations. Best. Idea. EVER. I love them, and actively hunt them. Without a doubt I have given more assassinations than I have been the victim of. I've even Showstopped people when I am the victim of the assassination.
My first Halo: Reach campaign marathon runthrough. Just an adrenline-pumped 6-hour spree of campaign. Straight-up epic.
Getting AMTAYS. It was a bitch, but I can now boast with the best of them. Heh. Considering I couldn't beat the first level of Halo 3 solo-Legendary, I though I'd never get it, but I apparently skilled up a bit in that regard. XD
Multiteam Oddball on Countdown? I think YES.
Multiflag on Tempest? Time for epic teamwork skills to make it a three-minute victory, pl0x!
Custom gaming. Never gets old, honestly.
Beating the Prophet of Regret into a paste in Halo 2 also never gets old.
Killing Brutes? My way of telling the universe that alien bear-ape hybrids all need to die. Because they suck. And my Needle Rifle will pwn them. XD
I despise people who abuse Armor Lock in Reach. You're a -blam!-ing noob and you know it.
Also, Yoink-ers in Team games. First of all, it shouldn't be possible to Yoink in a Team game. I worked hard to sneak/rush up on and into melee range of my victim; it's completely wrong of someone to steal that from me.
Breakpoint=vehicle/power-weapon whoring, and I don't roll like that. Soooo no.
Wall-e (also duh)
White Collar; Burn Notice; NCIS: Los Angeles; The Event; Stargate SG-1; Fullmetal Alchemist: Brotherhood; InuYasha; Family Guy; American Dad; Wipeout
Three Days Grace; Nickelback; Skillet; Avenged Sevenfold Disturbed Halestorm; Flyleaf; Paramore; Evanescence; Blue Stahli; Lonely Island; Red Hot Chili Peppers