This post has more of a wandering start that I'd expected. Scroll to the

I don't know if any of you are on Twitter but recently Piff The Magic Dragon (@ThePiff) pointed everyone to a yahoo answers page where someone said they wanted to perform Piff's act from "Fool Us" and wondered if anyone knew how he could make his own 'tacular' (if you've seen the show you'll know, that's his unfolding table with internal compartment.
Piff actually declares it to have cost him £200 in the performance so this guy wasn't just ripping off an act, he was trying to do it on the cheap. The gall!
The main effect was the 4-part card transformation sold by Piff himself as VDP, and it's nothing to do with the table so presumably it was the entire routine he wanted to perform.
But it got me wondering if he wanted to perform the entire act, including the 'tacular' (and not knowing what else to call it) , he'd presumably wanted to do the line "This is my show, Pifftacular, I'm Piff and this is my tacular". It really brought to mind how much of the act he was planning to steal. Was he going to dress as a dragon? Was he going to steal the name!?
Alas we'll probably never know. Piff offered a prize for the best sarcastic answer and I think the guy asking learned his lesson.

But it did get me thinking, at what point does inspiration become cheating? I'm currently trying to improve my cups and balls routine and I've attempted to saturate myself in as many different routines as possible to see what sort of things other magicians are doing. Then while researching you think "Ooh, that's a nice little move, I could use that" and start to wonder. Is it a signature move? Would someone call me a cheat for placing a ball somewhere with one hand while misdirecting with a wand twirl in the other (that was the move I liked).
At what point does learning a move from another performance become thievery?
Most comedians would consider a single stolen joke to be totally wrong, but those are usually far more personal than I'd assume a clever sleight would be.
But then I've been a trainee magician for (just) under a year, so what do I know?
So I thought I'd ask. If I saw a move of yours in a routine on TV or youtube or a street corner, and incorporated it into a totally different routine, how angry would you feel like getting?
-Stacy