Hi! This is the cheapest and easiest costume for this Halloween Eve.
With that, you cause sensation and spread terror everywhere... Muahahahhahahaa!
What you need is an Orange (yes, no pumpkin, only an Orange) and a knife.
Cut off the peel on the top and bottom of the Orange.
Cut six to eight slices of peel from top to bottom.
Peel Off one of the slices.
Cut a straight line at the center of the slice.
Cut some straight little lines perpendiculars to the first one.
Place the cutted slice in your mouth like a mouthguard.
And that's it!
Ah! And don't forget it, with only one orange, all family are prepared for Halloween, even Grandma!