In the first War of Independence, Mortis comically hitting Sir Killalot on the head with its tanto axe.
Shunt smashing Major Toms plastic bubblegum-dispenser head with its axe in the Fourth Wars.
Shunt's insistence on smashing model heads in general can lead to moments of these. One particular example during the first extreme with Subversion had an entire toy person on a submarine like robot get knocked off the mast.
Jonathan Pearce: Man overboard!
The Refbot and Sergeant Bash getting into a fight during one episode of Extreme II, with the Refbot attempting to put out Bash's flamethrower with his fire extinguisher.
Major Tom driving into the pit it had just opened in its Fifth Wars fight against Kat 3.
Sir Killalot catching fire after attempting to push Robopig over the flame pit in the Third Wars.
Razer losing to the laughable Aggrobot in the Third Wars, not because Aggrobot was a superior robot, but because the back of Razers weapon dug into the floor and left it unable to move.
During Hypnodisc's first fight, against Robogeddon, when the former has completely ripped the latter's armour off and wrecked the wheels, two of the Robogeddon team members are seen talking to each other:
Jonathan Pearce: What's he saying? "There's a way back into this for us"? I don't think so!
Not to mention Jonathan Pearce's hysterical laughter throughout much of the battle.
Following Hypnodisc's similarly one-sided Series 4 fight against Splinter:
Craig Charles: Very close fight, we'll have to go to the judges on that one. Only joking!
During the Series 4 fight between Dominator 2 and 101 (Dominator 2 is armed with a large axe and spends the fight sticking numerous holes in 101):
Jonathan Pearce: Do not try this at home, children, with a toothpick on your brother's favourite model car. Wait until Christmas Day and do it then!
In one Featherweight battle in series 7, one robot was put on the flipper and was flipped all the way out of the arena. To top this one, it happened again when two featherweights were put on the flipper, which launched one out of the arena again, but the other one hit the ceiling and landed in the pit.
Jonathan Pearce: That's come down with snow on it!''
Pretty much anything involving the ill-fated Joke Character Granny's Revenge. The first time it came around, it got burned to the ground by Sgt. Bash due to how highly flammable it was. The second time, it got bashed up, ignited again and squashed by an overhanging cooker.
One battle in The New Blood Tournament between 3 robots called Chopper, Mad Dog, and ICU basically consisted of Mad Dog doing next to nothing, ICU TRYING to have a fight, and Chopper driving into every danger the arena had to offer and generally trying to kill itself as quickly as possible. Jonathan Pearce's commentary adds to the funny.
After one rather dull battle, Craig Charles claiming that they couldn't show any highlights because there weren't any.