I honestly have no idea where I got these, but I think I've had them longer than I've been hanging around LJ.
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Conlige suspectos semper habitos ("Round up the usual suspects.")
Mors ultima linea rerum est ("Death is everything's final limit.")
Re vera, potas bene ("Say, you sure are drinking a lot1")
Vescere bracis meis ("Eat my shorts!")
Fronti nulla fides ("No reliance can be placed on appearance.")
Omnia mutantur, nos et mutamur in illis ("All things are changing, and we are changing with them.")
Res melius evinissent cum Coca ("Things go better with Coke.")
Tempus amoris cubiculum non est... ("The time for love is not in the bedroom...")
Trahimur omnes studio laudis ("We are all attracted by the desire for praise.")
Qui tacet consentit ("He who is silent agrees.")
Maxima debetur puero reverentia ('We owe the greatest respect to a child.")
Vacca foeda ("Stupid cow!")
Die dulci fruere ("Have a nice day.")
Mihi ignosce. Cum homine de cane debeo congredi ("Excuse me. I've got to see a man about a dog.")
Noli me vocare, ego te vocabo ("Don't call me, I'll call you.")
Non curo. Si metrum non habet, non est poema ("I don't care. If it doesn't rhyme, it isn't a poem.")
Utinam barbari spatium proprium tuum invadant! ("May barbarians invade your personal space!")
Ventis secundis, tene cursum ("Go with the flow.")
Sic faciunt omnes ("Everyone is doing it.")
Pessimum genus inimicorum laudantes ("Flatterers are the worst type of enemies.")
Tu quoque ("You too!")
Captantes capti sumus ("We catchers have been caught.")
Corripe Cervisiam ("Seize the beer!")
Te precor dulcissime supplex! ("Pretty please with a cherry on top!")
Vita est quod accidit dum in aliis consiliis occupatus es ("Life is what happens to you while you're busy making other plans.")