I have two things to say. One: this is about to be absolute crack. Two: If you know, you know. If you don't know, I'll tell you at the end. Oh, and three: spoilers for MoM

An Unusual Incursion:

They dashed frantically from dimension to dimension, with no idea where they might end up as they flew through one portal after another. From a strange jungle in shades of pink to a massive round mountain, they fell through yet another portal that spit them out inside a giant bubble. The bubble struck an ocean of bubblegum pink water. A rubber duck the size of a cruise ship floated past and the water swelled with an impending wave. From above, a green hand belonging to a one-eyed alien descended and smacked the water, creating a geyser that shot them upwards. They fell into a whirlpool and stumbled into the next universe.

If there's no hospitality, just get out of town.

You can be light on formality and say,

"I guess I'll see you around."

You've got not obligations, nothing holding you down.

Find a new situation and say,

"I guess I'll see you around."

They entered outer space, but the planets were the size of yoga balls, so they hopped across them to avoid falling into oblivion. A comet narrowly avoided smacking right into them. The next portal took them to a subway, unoccupied but for a zebra reading a newspaper. Next, they raced through a forest of giant floating baby heads, then found themselves shrunken down to fit in the chandelier of a fancy restaurant. They passed through rows of giant ducks lashing each other with the tails of their long pink hats, gray prisms with their own faces popping out every which way, psychedelic swirls of color, then flashing squares of color.

A realm of trees made of purple hands reaching desperately for the sky, a pair of eyes set in a green head watching them from the horizon.

Throngs of people with odd proportions, and in the distance houses perched on pipes.

An endlessly spinning purple spiral that threatened to suck them in.

A looming structure of green pipes.

Zebra print as far as the eye could see, plus two zebras sitting at a table.

Darkness, with nothing but abstract shapes to indicate they were anywhere at all.

Candy canes. Just everywhere.

A bright green eye against a sea of endless blue, that followed them as they passed through.

Green pixelation, with nothing else in sight. Then suddenly, everything around them sprouted eyes and mouths.

You've got no time to waste on sentimentality.

Get out and find yourself a brand new reality.

Get out and find yourself

A brand new reality, a particle duality, a new dimensionality

Yeah, yeah.

I guess I'll see you around.

Instead of a green circle, the next portal opened in the shape of a star. Everyone ground to a halt as a man in a red cloak and a girl in a denim jacket spilled through. Both groups froze in surprise, staring at each other.

"Are you from this universe?" the man in the cloak asked.

"No. Just passing through." Phineas hefted the device they used for making portals.

"You have a device that allows you to hop between universes?"

"Yeah. We're just going around clockwise until we reach the right one."

"Clockwise?" the girl asked.

"Yeah. It takes way less energy than trying to go against the current."

The man turned to the girl. "Did you know about this?"

"Not a clue."

"Good news!" Doofenshmirtz announced. "We seem to have lost our tail."

The man immediately brought his hands up in a defensive stance. "You're being followed?"

"Not anymore. I just said that."

"Who's following you?"

"Was following," Doofenshmirtz corrected.

"An army of robots from an alternate dimension ruled by an evil version of him," Ferb explained, pointing to Doofenshmirtz.

"We're running from a witch trying to steal my power so she can usurp a version of herself and be a mother to her children who don't exist in our universe," the girl explained.

"Now that's a tragic backstory."

"We should probably get going," Phineas said. "Good luck with your witch." He activated another green circular portal.

"Good luck with your robots," the man in the cloak replied.

They vanished into the next dimension.

Hopping clockwise through dimensions is a dangerous thing,

But it seems to help a lot if we sing.

And we can sing about

A brand new reality, a brand new reality, a brand new reality.

I guess I'll see you around.

My number one "bucket list item" to see in MoM was a mad dash through dimensions sequence like from Phineas and Ferb Across the Second Dimension, just utter chaos as they flip from one dimension into a weirder one. Sam Raimi did not disappoint. Although there was no catchy musical accompaniment. If you've never seen it before, watch the video for the song "Brand New Reality," you won't regret it.