Boog asks Elliot to sing 'Teddy Bear's Picnic' to help him sleep out in the open. Elliot doesn't know the words.
Elliot:[off-key] Once there was a magical elf who lived in a rainbow tree./He lived downstairs from a flatulent dwarf who was constantly having to pee./One day, the elf could take no more,/So he went to bang on the rude dwarf's door,/And what do you know? They suddenly both were maaaaarried!
Even better is that he pantomimes the whole thing. Including the "pee" stanza.
Boog 'drunk' in the back of the van. "If you go down to the woods today, there's... gonna be some fries!"
Also a little later when Beth looks at him and he waves and smiles before abruptly vomiting all over the garage window.
"SOMEBODY FORGOT TO FLUSH!!"
Rodger the cat from Open Season 2 and 3. "Oh Stanley, its been AGES!"
Jerk Jock Ian turns mid-leap to see the water coming and just Screams Like a Little Girl. It wouldn't make the already hilarious scene less awesome if he didn't, but he does and somehow that makes him just a tiny bit more sympathetic.
Shaw sees the water coming, and starts rolling up his window.
THERE HE IS! He's gone. THERE HE IS! He's gone. THERE HE IS!
QUIET! I'M TRYING TA DRIVE!
On pooping in a bush
Elliot: It's just like riding a bicycle. Except you're crappin' on it.
When Boog blames Elliot for getting him sent to the wild and is holding him over the edge of a cliff, Elliot asks him what he's going to do and Boog drops him...into his other paw and lifts him away from the cliff.
In Open Season 2:
Elliot exaggerating Mr. Weenie's "kidnapping", by using one of the bunnies.
Boog: Elliot, are you maybe putting a little bit too much on that? Elliot: Listen, Boog, I'm telling the story!
Ian showing his sympathy: "Sad story." "Tough break I miss him already."
The gang covering Mr. Weenie is whatever liquid they can use to slip him out of his collar.
"Close to You" starts with a truly horrible transition in from Elliot.
"I'm here to rescue my lady, kick butt, and take names. What's your name?" One Gilligan Cut later...
Open Season 3:
Ian: The jungle tends to be denser and hotter. McSquizzy:(hits Ian's head) Deer! Ian: What? I travel!
Serge: He's really lost it. Maria: Could be stress. Ian: Could be mad bear disease. Rosie: It could be stupid deer disease. Ian: Seriously? Is that going around?
Ian's engine sounds when he and his herd are moving anywhere are really funny; partly due to his voice and partly due to the fact he does it the whole time.