Enterprise flies thru a time/space anomoly (wormhole) into the Farscape universe
Enterprise enters the Star Wars universe (predictable, i know) 
the Xindi Reptilians and Insectoids meet Steve Irwin, the Crocodile Hunter
i’ll elaborate later
I like Enterprise and all but I can’t say I would be that excited to see it cross over with any other series. If we were talking TNG or DS9 instead, then I’d have a few though.
But just imagine the sheer humor if Steve Irwin was on an away mission on a Reptilian or Insectoid ship, or worse, in the Council chambers
“Crikey!, look at this bipedal lizard, aint’ he a beauty, what i’m gonna do here, is sneak up on him, and grab him by his tail, careful Steve, don’t want him to tag me!”
(holding a Xindi Bugling)
This little beaut is a young Xindi insectoid, when he grows up, he’ll be ten times as big and have a vicious mean streak, look at 'im squirm, Crikey!..what’s that Terri, you’re detecting an insectoid warship?, what do you mean they’ve got a weapons lock on us?, Crikey, you really don’t think they’ll fi… <static>
(cut to bridge of NX-01)
T’Pol; Captain, we’re getting a distress call, the frequencies are distorted pretty badly, we’ll have to decrypt it
Quantum; route the signal to Hoshi’s station
Hoshi; captain, it’s in Federation Standard, it’s pretty badly mangled, i can only make out one or two words, routing to speakers
<static>…Crikey!..<static>
Given tonight’s episode, the History Channel.
Schindler’s List
Oh, wait…
As long as Archer wears a red dress. Er, shirt.
It takes a long time and a lot of hard work to be a Star Fleet captain. There’s drinking and whoring and screwing, and then more drinking, and then if there’s time, more screwing!
Where did you steal that, Noclue? Sluggy Freelance? 
Enterprise visits Discworld.
Quantum visits Shatner?
Over-acting debate?
Enterprise/Ender’s Game
That’ll take care of the damned Xindi, and the Sulliban. And, with a little luck, the stupid time-travel subplot.
Or, Enterprise/Gunsmoke. Then they could hire D.C. Fontana back as a guest writer.
Tripping The Rift
;j
Enterprise meets Dr. Seuss
Do you like green eggs and gahk
I do not like them Vox of Mox
Would you eat them with a Xindi?
Would you eat them with a Mindy?
Enterprise meets NYPD Blue:
Scene: Inside a cramped dingy interview room of the 15th detective squad. Trip and Archer are seated and appear dismayed not only to be there but also by the behavior of the detectives. Sipowicz is ballistic grabs Tripps lapel and pulls him upright in his chair.
Det. Sipowicz: “Why does your show Suck”?
Tripp:(recoils from the detective’s furry)“what,…”
Det. Medavoy:“Well you see sir, Trek is a top shelf television commodity with an almost 30 year history of fan loyalty but your show is barely on the radar.”
Tripp:( Sipowicz rises one hand as if to strike Tripp who shields his head and begins sobbing) “OK, ok, It’s the producers. They’ve never cared about the people who care about the series, they treat continuity like silly putty and they wouldn’t know a good script if they ever saw one.”
Det. Sipowicz:(Lets go of Tripp’s lapel and sighs, suddenly wheels and slaps the back of Archers head)
Archer:(suprised) “What was that for ?”
Det. Sipowicz: “I’m making your wish come true.”
Archer:(confused)“what,…”?
Det. Sipowicz:“Any minuit now you guy will tellport or whatever it is you people do to get back to your ship and you’re going to look at him and say I wish he’d have tried that stuff on me.”
Away Team on planet, Archer sees a person admiring their reflection in a mirror, when they person walks away Archer makes to look in the mirror and sees an elderly green skinned woman … just as he’s about to say “Oh boy”, the mirror (actually a door) opens and the elderly green skinned woman screams “what are you staring at, you wanker?”
Or …
Away Team on planet. Archer “Now what do you suppose that is?”
Malcolm “Hmm, perhaps it’s some form of lottery device, the symbols on that, match the symbols on this”
Malcolm is standing in front of a DHD and Archer is looking at a Stargate …