Search: teacup pig
Why: On "How I Met Your Mother" (which I don't usually watch, but it's been a slow day), Barney keeps a teacup pig as bait for getting ladies up to his joint.
Answer: They are just baby miniature pigs, but they grow from 8 to 20 inches at the shoulder! That's teeny! Miniature pigs weigh way less than normal pigs, from 29 to 65 lbs. - generally less than 150 lbs.
The More You Know: Little bitty pigs get along with puppies and kitties AND can be litter trained. (That is better than a bunny, which will just eat your furniture and poop on your floor.) Only $1,000!
Here's an aggressive infographic without much graphic: