Improbable

There’s a big difference between improbable and impossible.
No matter how improbable it is, Henry still managed to get chased by a herd of angry elephants across campus and into the Chemistry final exam.
Impossible is explaining to the professor how he managed to get chased by a herd of angry elephants across campus and into the Chemistry final exam.
“And more importantly, why did you bring them here?” asks the professor.
“You lock the door at nine,” Henry says. “And I didn’t want to miss the final.”
The professor nods, mutters “Fair enough” and hands out the blue books.