From time-to-time, internet correspondent MA points me toward various cartoons. He noted this one, with the subject line in his message, "Caveat Emptor".
Okay, I laughed at the situation. But then I thought, "This is exactly the intention of caveat emptor [let the buyer beware]." From now on, unless he suffers from extreme stupidity and myopia, Dagwood will ask the price before committing to buying two hot dogs. I have had many, many Dagwood-type experiences. I hope I learned from them.
But unfortunately in today's nanny-state mentality, what too many people learn from their mistakes is that politicians will listen to their whining, "There oughta be a law..." Rather than assume responsibility for their decisions and actions, people want the gubmnt to step in and not just protect them, but also make decisions for them. But the more that happens, the less we think and the less vigilant we become.
With this mentality, people will press for regulations/legislation requiring Elmo to list his prices up front so people aren't deceived (or punished for being careless!).