Lex non curat de minimis.
Caveat emptor.
Roma locutus, causa finita est.
Vita brevis, ars longa.
Quod scripsi, scripsi.
Ecce homo.
Quod erat demonstrandum.
Post hoc, ergo proter hoc.
In hoc signo, vinces.
Credo quod est absurdum.
Check out my AIM screenname in my profile.
Not that I know Latin. I stole it from that book Latin for All Occasions.
Non Timeo Nessor
Don’t Fear the Reaper
Sona si Latine loqueris.
Honk if you speak Latin.
Dico, Dico, Dico!
I say, I say, Isay!
gee, spot the Discworld fans…
Res Ipsa Loquitor
“The thing speaks for itself”
Habeas Corpus
“you will produce the body”
Lex non curat de minimus
“the law is not concerned with trifles”
Cujus est solum, ejus est usque ad coelum ad infernos
“To whomsoever the soil belongs, he owns also to the sky and to the depths”
Romanes eunt domus
“People called Romans, they go to the house”
Is ab ille heres ego
Fortibus es in ero
No sese Thebe trux
Vatis enim Pes an dux
The above is an old schoolboy joke. Don’t try too hard to translate ti though. It “translates” as:
I say Billy; here’s a go,
Forty buses in a row.
No, says he. They be trucks.
What is in them? Peas and ducks
That’s close enough, Colibri. Though I was expecting someone to pop in with “I didn’t know Gloria was sick!” 
Then there’s the advice given by the Delphic Oracle to a warrior before deciding whether to go to battle…
“Ibis, redibis, nunquam per bella peribis…”
[You will go, you will return, never in war will you perish…]
or was that…
“Ibis, redibis nunquam, per bella peribis” ???
[You will go, you will return never, in war will you perish]
The moral of the story is to get everything in writing so you can check the oracle’s punctuation…
Kerriensis
This is why you will virtually never find a nominative present participle in the works of any good Roman writer.
Varium et mutabile semper femina
Woman is always a changeable and capricious thing.
It’s good to know some things are of all times. 
And Tuesday is usually worse.
Feles mala! Cur cista non uteris? Stramentum novum in ea posui.
Bad kitty! Why don’t you use the cat box? I put new litter in it.
Si Hoc Legere Scis Nimium Eruditionis Habes
Always wanted to get this on a T-shirt for my father-in-law.
( If you can read this you’re overeducated)
So, when the mods close this thread, will they do it with Ohe! iam satis est, ohe! libelle… ?
[sub]“Whoa! Enough now, whoa! little book”. From a closing epigram by Martial, don’t y’know.[/sub]
Bessi, mea vocca, te amat.
Bessie, my cow, loves you.
Philosophia est ars vitae.
Philosophy is the art of life.
Nihil me terret, sed Latina.
Nothing terrifies me but Latin.
Romanes Eunt Domus
Translation: People called Romanes they go the house???
Blech link doesn’t work - go to Scene 8 for the whole dialog
Gp
I know, I know!
“Vince had to pawn his signet ring.”
Of course I do…sed quid in inferno dicet?
Ars gratia artis.*
Macdonaldus senex fundum habuit.**
Sit vis vobiscum!***
[sub]*Art for art’s sake
**Old MacDonald had a farm.
***May the force be with you![/sub]
Sorry, ResIpsa, but it’s actually spelled loquitur.
AAAARRRRRGGGGGHHHH!
Well, fabulous…now my post count feels like a colossal lie. I’ll go cry now.