What’s the difference between a photocopier and the flu?
One makes facsimiles; the other makes sick families.
Alright listen up, buttercup. This joke is all about wordplay. See, a photocopier makes "facsimiles", which sounds like "sick families". It's funny 'cause it uses similar-sounding words in a goofy way. You probably thought a simile was when you fake smiled, huh?