cancelling prime trials
I have signed up for prime trials (on purpose) several times. My kids also always want to whenever they are buying anything with their amazon accounts because PFYs hate to wait for deliveries. I think the first time I signed up, it was made pretty clear that you could instantly cancel and would still get the 30 days of free next-day delivery but last time I did it they made it sound like cancellation would stop the benefits immediately, so encouraging you to forget to cancel later.
I thin the one time that someone forgot to cancel in time and was charged for the fist month they did get a pro-rated refund so that actual amount billed was pretty small.
You have to assume that Amazon will always be evil and if you can't see the scam, you haven't looked hard enough so I work hard to instill paranoia and suspicion into my kids