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'I hate snowboarders!'

Hatfield and McCoy International battle.

"Sometimes I think you guys don't want peace."

David Anderson vs. Goliath

'Dogs are so silly: Just throw a ball or a stick and they'll chase it and bring it back!'

I only root so hard for my time because I hate your team so much.

You were warned about mixed marriages.

Tic-tac-toe

"Just being proactive."

"...And don't give me that 'I hope his precious little Blackhawks lose' look either!"

Next Wave Collegiate Sports

"I guess there ain't room in this town for two bonsai specialists."

"That's $20 for you if you pluck the tail feathers off my rival over there..."

"Yin and Yankee fan"

Fight on the top

'I warned him about watching the game at the opposition's pub.'

"That Melinda Alvarez thinks she's so smart! Well, I've been studying, and I'm gonna teach her a lesson on the test we have today!"

'The rivalry at the pony club is getting out of hand.'

Federal Employees Annual Easter Egg Hunt: 'This isn't fair - the CIA always wins!'

'For heaven's sake Armitage - can't you just accept 2nd place in the best leek category?'

Once again, Daisy had won the 'Employee of the Month' award...'

Lion v Kiwi.

Fighting Gondoliers.

Dog tallying his score against the mailman.

'Our competition is quite energetic.'

"I thought they decided who was the best team last year?"

I've just found out our competitors are losing money faster than we are.

'Friends are important...but you need enemies to keep your edge.'

'You're useless, Johnson. I like that in a rival.'

When feud becomes best seller! Moby Dick vs Herman Melville!

"We never had a 'last conversation,' but if we had, you’d have lost."

'It all started over who had the bigger medical file.'

"Joseph's jealous brother adds bleach to the coat of many colors wash."

Keepy-uppy with the Joneses.

"Nobody realized I was a man to watch until it was too late."