Quotes / Four Terms Fallacy

"If it looks like a duck, swims like a duck, and quacks like a duck, then it's probably a duck."
"A dry crust of bread is better than nothing, but nothing is better than a big juicy steak. And therefore?...A dry crust of bread is better than a big juicy steak."
http://tvtropes.org/pmwiki/pmwiki.php/Quotes/FourTermsFallacy