If a spell didnt work,it does not mean it was Fluffy
It could have been wrongly Casted.Many factors contribute to spells failing...You can tell the difference based on common sense for one thing.A spell that will make you fly like a bird or change into a superhero would be Fluffy..As always if you are asking this Question you have not learned basics yet
Start reading up on the basics and books for beginners.
Really? Cunningham? I would say D.J. Conway and Silver Ravenwolf, but even though I love Cunningham, I admit some things he says are rather loose and 'do what you feel like'. Nothing wrong with that, but for a new pagan a little conviction is nice.
It's been said above, but any spell that claims the impossible, or instant, dramatic results will not work. Magick used in spells is a natural energy and when you cast a spell you are essentially influencing this energy to bring a desired change to you.
Well my definition of Fluffy is Soft and Corny
A bit different then the term of f luffies on the board
I don't have a word for thinking Magick can make you a superhero
Besides watching to many movies lol
Most commonly it is best to write your own spells, but as has been stated, common sense is key.
Telepathy spells won't work for instance, but some spells simply are not going to work, for example: if a love spell contains the use of herbs that are not correlated to love, or if all the spell is, is a sentance with so mote it be written three times on the end (which is very common).
Honestly I would say learn a lot before you try to tell them apart, after a while you will learn to differentiate between the real and the fake.