Skylands, Episode 16: Inside of a spider dungeon that has already killed them frequently. "I've got a bow, an arrow, and a piece of string. Let's f$#@ing go."
In Sky Block, Episode 5; "Save the blocks!"
The "Filth Bridge" song.
Smiffy in episode 8 of their DayZLet's Play pulls off the "Brutal Axe Murder!" in the title.
The entire crew being acknowledged by the developers of the Trials games as true fans and thus their names have TF at the end to signify it.
The guys are actually pretty good at Halo 4. Special mention to Alsmiffy in episode 3, "Flood", where he manages to pull off some sweet kills and becomes the last man standing.
All the Sirs have Taken a Level in Badass in Feed the Beast. Ross became a one-man building crew, Trott's slowly becoming a clever machinist, and Smiffy is growing in magical power with every bulk update. Compared to their earlier series, they are dying far less and working together with increasing regularity.
Smiffy finally made a nuke. The Sirs looked for a a village to blow up, but Smiffy stumbled upon a gorgeous cherry blossom forest. He planted the nuke in the center of a small hillock and activated it. Within two minutes, the sea of pink trees became a radioactive landscape of destruction. He can make more at any time.
In The Walls 3: Aztec, one of the Yogscast Minecraft mini-games, they took a surprisingly pragmatic tactic - they decided to build a tower to provide themselves a sniping position while also gathering as much resources as they could, and extend it outwards while they wait, expecting the other teams to kill each other in the meantime. Amusingly, from the perspective of the other groups, they're unknowingly building a giant penis in the sky. However, this tactic enables them to win, as the other teams do kill each other as predicted, with only Simon and Duncan left - Duncan is killed by Smiffy with a bow, and Simon takes damage, causing him to panic, flee underground as the trio pursue him, and tried to lay a TNT trap, which is narrowly thwarted by Trott digging right on top of him and destroying the TNT before taking him out with Sips' golden sword of all things.
In Minecraft Feed the Beast #64, the entire team randomly bursts out into a rather impressive acapella remix of Eurythmics' "Sweet Dreams (Are Made of This)."