Are there that many scorpions? Spiders I can understand
Yep, they love nice warm moist environments, ie. shoes. If you're out in the bush, it's standard practice to shake your shoes out before putting them on. Some Saffrican scorpions are venemous enough to kill a human if not treated urgently. Urgently as in like an hour, which is often far from possible when out in the sticks. The nicer ones will just paralyze you for a few hours.