When interleague play rolls around every year, plenty of hilarious sportswriters and Internet pundits will make the amazing, incredibly original joke that many of the interleague "rivalries" aren't really rivalries at all! The construction will go something like, "Bla bla bla interleague play is horrible just look the Rays are playing the Astros what kind of rivalry is that baseball tradition bla bla bla," only less funny.
Well, look at this: One of these so-called "non-rivalry" interleague series (Padres-Mariners) produced a bet between two
gentlemen people, one a fan of each team. And the loser had to make the above video, perhaps the best baseball rap so far this season. Making it even better: I think part of the rap is about the girl he lost the bet to, so about half this song is pretty nonsensical.
This is amazing. I declare Padres-Mariners a rivalry as classic as Red Sox-Yankees immediately.