It's funny because it's true?
The Onion, sadly, hits the nail right on head with their headline "Rare Species of Frog May Hold Cure To... Ah, Never Mind, It's Extinct".
Here's a snip
MANASSAS, VA—According to a study published Monday in The Journal Of Experimental Biology, a rare species of tree frog found only in a small section of the Amazon rainforest may give hope to millions suffering from…oh, wait, forget it. It's extinct. "