In Raven: The Secret Temple, Nevar attempts to distract Raven by sending his Demons after the warriors. Raven gets up on his high horse about it, complete with the usual anti-evil speech... Until it's revealed that the "demons" are just watermelons on sticks. Seems even the master of all evil has a sense of humour.
In the fifth series, after one round of Demon Square, the two warriors who fell without getting a single question right are revived, upon which Raven comments that they don't have the knowledge of the Wisdom Tree, but they still do have something in common with it, "Your heads, too, are made of wood!"
Bonus points for these two warriors being the warriors who made it to the final from that week.
An earlier Demon Square playing in series 3 week 2 had all five warriors fail. After reviving them, Raven comments "You had gold in your sights but sawdust in your brains."
In series 5 week three's playing of Millstone Towers, one warrior, Suhan, actually knocked a skull off a post when her team was running back to get a millstone. For context, both teams in that challenge kept knocking skulls down due to carelessness though most of the time it was done when getting millstones through each set of posts.
Suhan would go on to make the final.
Raven's comment about Aksu and Yonra's not so great performance in the leadership trial Rope Race in The Secret Temple and how the tangle of ropes possibly "tangled [their] minds".
When Danil and Sonos failed Tower Build due to the former jumping for the rings before their tower was high enough, Sonos had the following to say in his Confession Cam:
The Long Staff challenge of Series 2 week 3 had numerous of these. After a relatively uneventful victory for Dyasa over Huiso, the next bout between the former and Ersca involved Ersca inexplicably trying to straddle Dyasa's tower and promptly getting knocked off. Skiha then anticlimactically beat Dyasa with one hit, letting off a Big "YES!" as she did so. Her subsequent battle with Ishal had the two laughing the entire time and looking ridiculous as they swung all over the place, trying to keep their balance. Finally, Warka let off a comically over the top "Woah!" as he lost to Skiha.
For the wrestler:
At FMW Judgment day, he was fighting with Tetsuhiro Kuroda on the entrance ramp and got put in a cradle, which resulted in the two of them rolling down and almost tumbling off the side.