To return a defective fluffy to Hasbio for a refund it must be euthanised before placement in return box, The simplest technique to achieve this is with a pair of household scissors, Simply cut off the front of the fluffy about 1 inch behind the eyes.
Always euthanize your fluffy before disposal! Otherwise it might survive and become a feral!
Decapitation is of course a quick and relatively painless way to euthanize a fluffy; but for sheer body horror satisfaction nothing beats a beating with the Sorry Sledgehammer.
While using scissors is a bit more effort and material cost compared to old-fashioned neck snapping, the major benefit is in reduced wrist strain for workers performing hundreds of culls thanks to reduced repetitive motion.
Also you get to listen to them grovel before dying.
If you snip too high and miss the brainstem, the fluffy can survive and lead a fairly normal life (for a fluffy). This is because fluffies lack extensive higher-brain function, so massive head trauma is effectively a non-issue; and because fluffies are too stupid to really use their senses anyway when they have them intact. Always violently neuter the fluffy prior to beheading, to prevent the spread of ferals.