This is the the quick ending because this was my first fic and because every story needs an ending.
As Snips and Snails and their historical guest were traveling through the time tunnel just having a good time. Tragedy happened because out of nowhere the TARDIS carrying human Doctor Who and Rose crashed right into them.
The resulting explosion triggered a cataclysmic event that destroyed the space time continuum.
EVERYONE DIED, THE END
But luckily, the damage was only limited to their own universe.
Alternative Ending
Once they convinced Star Swirl the Bearded (he is a filthy hippie that smelled of bong resin) to join their group, Snips and Snails brought them all back to their own time.
First they went back to Snail's house to go get Dinky to help them take care of their guests.
"Dinks can you help us watch over these guys as we go to Snails' house to get a camera?"
"Sure." She had the six creatures follow her before they ran into Sweepy the local hobo and like Gamera friend to children.
"Hey, you wanna help me watch these guys?"
The vagrant nodded. "THE GOV'MENT STOLE MY EYEBALLS!!!"
"But, laddy ye still have your eyes." McWalrus replied in very confused tone.
"That's what they want you to think!!!"
Dinky and the group rolled their eyes, except for Star Swirl. "Duuude, finally someone agrees with me."
Half an hour later the light purple unicorn brought them to The Lone Pine Mall.
"This is a mall. "
The historical figures fucked up the mall, while Dinky and the homeless stallion that eats out of Snip's trash can tried to stop them, but failed miserably.
Snails' dad got pissed and put the historical figures in jail, but our two heroes busted them out with the use of their phone booth.
They did their presentation.
"I created the, the, an-anpro-bib-bib, fuck it... I created the changing spell. I like the future, the future is awesome, man..." Star Swirl said as he munched on some Funyuns he teleported out of a vending machine.
When the other students went silent, Snips ran in to continue the speech and save the day. "...Ponyville high is the greatest high school!!!"
The auditorium cheered and they passed high school and went on to create world peace with their band. Somewhere down the line there were evil robots, a villain, murder, hell, Death, heaven and shlong faced aliens. Wild Stallionz!!!
The ending is essentially the same as the movie: Bill and Ted's Excellent Adventure.