Rivalry Enthusiasts Mugs

'I hate snowboarders!'

'He's been this way since the Red Sox won the pennant!'

Hatfield and McCoy International battle.

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

The Andrews brothers had an ongoing competition of seeing who could donate a pint of blood the fastest.

David Anderson vs. Goliath

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

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

You were warned about mixed marriages.

Tic-tac-toe

"Just being proactive."

"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..."

Next Wave Collegiate Sports

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

Fight on the top

"Yin and Yankee fan"

"You say that I love the Liverpool football team more than I love you?...."

'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!"

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

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

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

Lion v Kiwi.

Fighting Gondoliers.

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

"I still hate you."

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!

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