Funniest Redwall moment

[Skyblade]

I love the moment not too far into Martin the Warrior when Keyla and Rose are singing to each other and as the vermin guard approaches, Keyla sings a song about maladies that he invents on the spot, and the vermin take him seriously. They argue with each other about the names of the ailments and try to recreate the song.  Even Keyla laughs aloud.
"I knew a fine big strong hedgehog long ago, he laughed at flurgy twinj.  Poor creature, he never laughed again!"

Yes, I like that part I think there's even a forum member called flurgy twinj, which is cool.

Vermin 1: From flurgy paws and grungy tummy, spirit keep us free. Wobby whiskers an' da de dah...
Vermin 2: Da de dah yerself, boulder bottom. They're not the right words!

[Banya]

I love the moment not too far into Martin the Warrior when Keyla and Rose are singing to each other and as the vermin guard approaches, Keyla sings a song about maladies that he invents on the spot, and the vermin take him seriously. They argue with each other about the names of the ailments and try to recreate the song.  Even Keyla laughs aloud.
"I knew a fine big strong hedgehog long ago, he laughed at flurgy twinj.  Poor creature, he never laughed again!"

Yes, I like that part I think there's even a forum member called flurgy twinj, which is cool.

Vermin 1: From flurgy paws and grungy tummy, spirit keep us free. Wobby whiskers an' da de dah...
Vermin 2: Da de dah yerself, boulder bottom. They're not the right words!

You're right, there is someone called Flurgy Twinj.  That's hilarious. 
You've got me laughing at this scene all over again.

[Wot, wot!]

  there are so many funny moments 

loved this one...

"Oh, corks. Do I have to climb up that great swayin' thing an' fold all those windy old bedsheets? Do I really, sir?"
  Rawnblade pointed a stern paw to the topmast. "Up, Woodsorrel, up!"
-Mariel of Redwall (Rawnblade to Tarquin L. Woodsorrel )

[Hickory]

Log a Log whipped out his rapier and pointed it at the stairs leading down to Cavern Hole. He yelled urgently, "A big rat with a bag of strawberries just ran down there! We can't 'ave that, can we? Get 'im!"
Whooping and roaring, the Dibbuns tore off in pursuit of the imaginary villain.

[The Skarzs]

Oooh, that one part where the Dibbuns were on the wall and were throwing vegetables and stuff at the ones below to keep them off. (The picture for the chapter was great too.)

[Ungatt Trunn]

It's been a little while since I read any Redwall book (since I've been reading LotR and Crime And Punishment recently), so I honestly can't remember any funny moment in Redwall that well 

[Eulaliaaa!]

Oh, I forgot what book it was from (Mariel of Redwall, maybe), but there was a band of rats attacking Redwall and dibbuns (Grubb, Bagg, and Runn I think) and they stole knives from the kitchens. They were chopping the grappling hooks that rats were throwing over the side of the walls while the Redwallers were busy attacking the rats from the other side.

[The Skarzs]

Child murderers. . . Or would it be "murderer children"?

[Eulaliaaa!]

Murderous children, I think. I'm pretty sure they didn't know the death and destruction that they were causing, I doubt they would have killed the rats if they knew.

[Mhera]

Can you really call them murderers anyway? Murder is unlawful killing, and since those varmints were invading the abbey with the intent to kill then their deaths were well deserved.

[The Skarzs]

Self defense, then.

I don't think that they would have been allowed to know that they were responsible for the deaths of quite a few creatures; would have scarred their minds, methinks.

[Eulaliaaa!]

Self-defending children it is. It would have traumatized them, knowing they had actually killed other creatures. They thought it was all a game.

[Wot, wot!]

warrior Dibbuns 

This one made me laugh too  ...

"Figgs followed Rosie about, throwing her paws in the air and repeating over and over, "Lack a day, no tucker's left, lack a day!" -The Bellmaker 

[Hickory]

Raventail took a pace back, executing a scornful bow.
"Woah, Bigmagic fox be cleverer much much, scyoosee me!"

[rrrrr]

Abbess Lycian's teapot over the Abbey wall