Pigs are flying!

Pigs are flying!
Newborns are singing opera!
Gravity is no more!
I was given an A in Czech!

One of these 4 statements is true. Do you know which one? (Hint: what is the most impossible of all of them?)

Seriously, a miracle and a phenomenon beyond all comprehension. I stared at the grade on Student Central this morning and thought, "Am I still asleep? What kind of cruel joke is this?"

Ridiculous.