It's absolutely encouraged to send these to your enemies, though.
The card of two adorable brothers sitting on the lap of a monster with ears.
Source: sunspray.tumblr.com
The card that shows an army of bunnies firing off the eggs of their enslaved chicken.
Fantastic stuff!
Source: bytesdaily.blogspot.com
The card of three new BFFs: a bunny, a German soldier, and an Austro-Hungarian infantryman.
Where are they taking him?!
Source: bytesdaily.blogspot.com
The card that shows you exactly what monster is hiding underneath your bed.
Source: etsy.com