One time we went surf fishing and caught some perch.
We took the fish home and cooked and ate it. When we were about to throw the heads and guts away, we looked at the garbage bag, and this little white isopod was sitting there, still alive, angry that we ate his home. He was living in the mouth of a perch.
Then Ben busted out his giant book of north american sealife and identified the exact species of isopod.