Beware the Geeldikkop! Tribulus terrestris can provide you with many a flat tire. I cannot blame my current frustrations on the humble duwweltjie, alas. They were rife in the veld between my childhood home and school, and caused many a bicycle puncture or smarting foot. Baie-sukkel, yes. A common childish refrain it was, when someone wanted to snitch on you: “Run before the road is overgrown by duwweltjies!” Contrary to popular belief, it is not an aid to muscle-building.