A selection of objects described in the medical literature that have ended up in the brain via the nose:
A chopstick.
A ball-point pen.
A flying wire fragment.
A plastic stick.
A snooker cue.
A miniature fencing foil.
A gear stick.
Among ancient sources of history we also find the story of a mosquito entering Nimrod's brain and biting his brain off into insanity.
Well, if there is a hole or opening for something to accidentally go through, anything is capable of going through it.
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