Joke

So, this guy comes home from work, panting, trying to catch his breath, and plops down at the kitchen table.
His wife says, "Why are you so exhausted?"
The guy says, "Honey, instead of taking the bus home from work today, I ran all the way behind it and saved $2.50!"
His wife says, "You schmuck! Why didn't you run behind a taxi, and save $15?"