Playful Rivalry Lover T-Shirts

'They're Home!!!... HA-HA-HA... you are soooo busted!'

'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.

"Why don't you come get me? Oh that's right, you aren't allowed on the couch!"

You were warned about mixed marriages.

'Oh yeah, your dad might be on 4-1 in this afternoon's race, but mine is on 3-1!'

Tic-tac-toe

Danth battle?

Al's Diner. Special: Spaghetti. All You Can Eat $3.95. Ernie, don't play with your food unless you're sure you can win.

"Just being proactive."

Next Wave Collegiate Sports

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

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

"Looks like somebody brought a blanky to a pillow fight."

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

The Cricketer and the Golfer

Pole jumper about to land on a giant whoopi cushion.

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

"Yin and Yankee fan"

Fight on the top

Paradise FC: The Blessed Y The Rest.

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

"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!"

'This won't take long, nurse. This is the dog that got my best friend last summer.'

'I hate snowboarders!'

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

Lion v Kiwi.

'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!'

Strikeout Dog

Dog tallying his score against the mailman.

A Man mixing up his sports.

'Our competition is quite energetic.'

'Oh, yeah? Well, my dad can pretend to beat up your dad!'

Later accounts would call it the Greatest Water Battle of All Time,