A host of bizarre biomedical robots turned up at ICRA 2017, IEEE’s flagship robotics conference, which took place earlier this month in Singapore. We saw swallowable robots that poke the stomach with needles and worm-like robots that explore the colon. Equal parts unnerving and fascinating, these bots aim to help people—perhaps in ways we hope we never need. After sifting through this year’s presentations, we’re bringing you the five most terrifying and inventive video demonstrations.