Jack Syndrome 

A disease where the afflicted individual falls hopelessly in love with another guy or girl. Symptoms can be split into first and second stage.

During the first stage, the victim becomes hopelessly obsessed. As of now, all observed first stage victims have reported a month of first stage Jack Syndrome; one extreme case reported several months. Other symptoms during first stage Jack Syndrome can include nonstop thinking about the individual, insomnia, and extraordinary increase in vitality and energy.

During the second stage, the victim's obsession over the individual decreases over time. Victims have reported experiencing second stage Jack Syndrome for anywhere between a few months to a few years. Other symptoms can include depression, increased addiction to an activity (studying, working out, playing video games, etc...), and periodic thoughts about the individual.

Greyson: I just can't stop thinking about her!

Maksi: What do you mean?

Greyson: I don't know... I haven't been sleeping cause I keep thinking about her, and I have all this energy! Yesterday, I ran 10 miles without stopping, even though I only ate breakfast.Y-y-you think something's wrong with me?

Maksi: Nah, you just have Jack Syndrome.

Jack Syndrome by Maksi January 8, 2012

Reverse Jack Syndrome 

Reverse Jack Syndrome (RJS) is the opposite of the syndrome Robin Williams had in the movie "Jack." His character's affliction caused him to grow physically old while still being young in terms of years - RJS is the reverse of this. A person with RJS is relatively young and young-looking but acts and feels as if he/she is approximately 70 years old. For example, a person with RJS is almost always cold, regardless of temperature (this leads to wearing unfashionable slippers at home); has trouble hearing, thus the TV volume is always very loud; likes food commonly associated with old people, for ex. meatloaf and salisbury steak; has trouble with new technology; has preferences in terms of music, books, and culture in general that are usually linked with old folks; and is generally crabby, with the demeanor of a cranky old person.

"Jimmy, why is it 90 degrees in here? WTF?"

"Its cold in here."

"Ah, must be the Reverse Jack Syndrome acting up again."

Reverse Jack Syndrome by Drew D. from Kansas August 6, 2007

Captain Jack Syndrome 

A disease where a character in Doctor Who repeatedly dies yet continually, through a series of events, comes back to life.

'I think Arthur Darvill's character, Rory, might have Captain Jack Syndrome'

Captain Jack Syndrome by Doctor Maxwell February 5, 2012

Captain Jack Syndrome 

When your inner compass points you towards booty, the thing you most desire.

Nick: Damn, what was up with Rob last night? Never seen him hunt a girl so hard.
Mike: Ah dude, she is the hottest girl in school! That booty gave him Captain Jack Syndrome.

Captain Jack Syndrome by Hook Me Choob June 16, 2016

Jack Tripper Syndrome 

A situation in which two or more parties believe to have a mutual understanding of the subject matter, but unknowingly are addressing two independent thoughts or conclusions.

Direct from Three's Company:

Mr. Furley is suffering from Jack Tripper Syndrome and is standing outside the bathroom and eavesdropping while Jack and Chrissy are installing a shower curtain.

Jack Tripper: Okay, Chrissy, I'll get in the tub with you, then we can get it on.
Chrissy: Get next to me, I'll show you what to do.
Jack Tripper: This isn't exactly the first time I've ever done this.
Chrissy: Maybe so, but girls are better at this than boys.
Jack Tripper: Come on, Chrissy. A little less talk and a little more action, okay?
Chrissy: Okay, you do your part and I'll do mine. I don't think it'll reach!
Jack Tripper: Of course not, you've got to unfold it first!

Jack Tripper Syndrome by Andrew Rakaczki November 8, 2007

Jack Sparrow Syndrome 

When your inner-compass points you toward that which you most desire.

Especially used when a guy is going after booty.

"Dude, there's so many good girls for him, but he's too vain."

"Well, he isn't wrong; he's just got Jack Sparrow Syndrome."

Jack Sparrow Syndrome by Hook Me Choob September 17, 2016

Jacksyndrome 

When it’s past two o’clock in the morning you forget what happened the night before, feels like you’re drunk

I think I have jacksyndrome I don’t remember what I did on the bus

Jacksyndrome by Ghost0576 January 23, 2019