Snot Cannon
This is actually danagerous to health of those around the user and should be banned. Blowing air onto & into the user's mouth and nose will spread any pathogens to the surrounding area as it is not then filtered. It's moronically stupid and dangerous and will cause more infections and potentially kill people, not the wearer, no that selfish prick will be fine...
A fan powered costume caused a super spreader event in a US hospital as the fan spread around everybody near it the wearer's unknown illness. This a snot cannon and really REALLY dumb (and studpidly expensive to boot).