True, I did that a few times myself.
I remember there being an online community dedicated to scam-baiting, though they apparently are getting pretty dark, nearly racist in their baitings, so the rest of the internet's kind of shunned them too.
I regularly get phone calls from Argentina, that just hang up near-immediately, even if I accidentally answer them.
Clearly trying to get me to call back, so probably a "pay-per-minute" number or something.
They can be dangerous if you don't know what there up to, we need to make people away as @cryptfiend is doing as tell as many older people what to do