The only good I can say about the stupid phone pranks I did as a kid was that it later taught me that only immature kids do really juvenile stunts (I suppose by definition), and that cruelty to strangers is not funny. To my close friends is another matter entirely.
One of my favorite phone stunts occurred to me from the accidental dropping of a metal serving tray at home. It made a terrible clatter on the wooden floor that went on and on, as the platter spun around like a big coin and took forever to finally stop. I associated this large pan-like round plate, perverse little mind that I had (have), with the take-out pizzas my family enjoyed from a local shop.
It also happened that my voice, at 12-13, had deepened considerably before my buddies had. So I'd invite a few of them over to my house, when both my parents were at their offices (I was pretty much a latch-key kid then), and here's what we'd do:
We'd pick a random local phone number from the White Pages. I'd dial (literally) them, and tell them I was the "order guy" at Frank's Pizza, that their pizza was ready for pick-up and we wondered where they were.
Well of course they'd protest that they hadn't ordered a pizza. And I would argue back that they had, were they not so-and-so of this address, at this number? Well, yes, they were they'd say, but they never ordered any pizza.
And we'd go back and forth for a while on the phone, my buddies stiffling laughter in the background. Finally, at a sign from me, one of them would drop the "pizza" tray on the bare floor with a big crash, that would continue for a while as the plate settled. I'd be holding the phone close by to pick up the sound.
"Oh, well never mind," I'd say back to them. "Frank just dropped your pizza," and promptly hang up on them. Nothing could be more stupid.
Except once, in the middle of the argument on the phone, the guy abruptly said OK, he'd go ahead and drive downtown to get the pizza anyway. And he hung up before I could stop him with the platter crash.
I still feel guilty about him presumably showing up at Frank's and asking for his pizza and finding nothing waiting for him. Unless he was playing a joke on me, which I certainly deserved. Ah, the folly of youth...