I'm in New England, and we don't have goathead thorns. I understand they're quite nasty and must be pulled from you bike tires with pliers.
I've found some stuff over the years, and seen some weird stuff as well. I don't pick stuff up though, unless it's really interesting or amusing somehow. Like the battered Britney Spears CD's I spotted by the side of the road one time. Ya gotta admit, there's a statement there, but I'm not sure what it is.
I've spotted oddball tools, baseball caps, smashed cell phones (people really do have a love/hate relationship with these, don't they?) wallets (two occasions, turned them into the closest police stations.) and a broken Barbie Doll. Go figure.
t.