Okay, if a bug flies into your eyeball and it disappears into your eye where did it go?!

That probably isn't as annoying as when it flies into my nose! 😬

Your eye ate it to refill its aqueous humour

They bore through your brain.

*mind bleach*

My white blood cells will apprehend the bugs and force them into prison camps located inside my heart where they will be reeducated and forced to do manual labor

it can't go behind your eyeball. That'd be a major downfall of human biology.