Finger, hands, clothing, tools, rags, small animals, little children, etc...
Have you ever noticed, on the top side of the shroud, there is either a label or a warning molded into the plastic that says, "Caution fan". It doesn't say, "Caution airflow". In the business, the shroud was regularly referred to as the 'Caution fan' because that's what it said on it LOL
