What is Jarathon?
1.
A Day spent watching films featuring Jared Leto.
A Jarathon is only a Jarathon is there are Five or More Jared Leto Films Being Watched. Any less than Five Is called a Letofest.
"hey...fancy a Jarathon?"
"HELLL yes! Do we have enough films?"
"ummmm, no...we'll have to have a letofest instead."
See 
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a fear of extreme cold, ice, snow, frost, blizzards, ect.
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