Rivalry Reveler T-Shirts

"You realize, of course, that this means war."

The Championship Fight Between Heenan and Sayers, on April 17, 1860

'I thought the government had abolished blood sports.'

'Polevault envy'.

'Big sale at the Dog Store. Buy 1, get 2 free.'

Special Euro 2020 Menu: Humble Pie

Your enemy is defeated by Fate

Cat taunts dog at intersection.

Leaf Blower Showdown.

'She's trying to prove her masculinity.'

"Please join me in welcoming our competitor's ex-wife, who will now dish about his firm's weak points."

"I hear you quietly rooting for the Patriots back there."

'Here's one pound. There's only one team worth watching.'

'My mom can outshop your mom!'

"Uh-oh."

Baseball Angels

'My feet are killing me.'

'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.

'Can our software do that?'

'Shoot, this is nothing, you should have seen how good we had it back in ancient Egypt.'

"Eat my dust!"

“Sweet mother of Marmaduke... no!”

The Alpha Seltzer

You're the olive in my martini

Tic-tac-toe

'The grudge match.'

"I'm afraid Dad did not leave us anything of value in his will, but his last wish is for us to continue the feud with the neighbour's cat...

"Just being proactive."

Next Wave Collegiate Sports

'I told you, if the LA branch steals our thunder, there is no more dialogue.'

"...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."

'Well, I can't find anything in the rule book about it.'

"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!"