People get hurt all the time without noticing it. Occasionally, people get totally destroyed without noticing it, either.

5 A Taser Barb to the Brain

A 27-year-old drunken Frenchman refused to divulge his identity to the police, who responded by shooting him in the head with a Taser (presumably because someone had mislabeled it "Lasso of Truth"). Later on, the man went to the hospital complaining of a terrible headache, as if the troll from Cat's Eye had crawled up his nostril to do Zumba in his cranium.

New Scientist

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One of the barbed Taser darts was still embedded in the man's skull and had penetrated his brain, presumably activating a latent invisibility gene because nobody could see this without a fucking X-ray.