A Snadwich (mistakenly thought to be derived from mispelling the word 'Sandwich') is a mystical small furry creature that resides in the darkest corners of the majority of households across the world.
Their presence is only noticeable through the disappearance of socks.
NB. This is never a pair of socks, only one (leading to the current odd sock problem across the globe).
The Snadwiches breed and raise their young in said stolen socks. When more and more socks go missing in a household, it normally suggests a 'Snadwich Infestation', for which a 'Snadwich Exterminator' must be contacted. Failure to do so could lead to a 'Snadwich Attack' (the need for more territory drives the increasing population of Snadwiches to be more agressive) which can often be fatal.
When a human sees a Snadwich, very often they mistake it for a ball of dust or hair.
'Why do I have so many odd socks? It must be the snadwiches again...'