What Happened?

[Jim Nunziato]

Frank was driving along minding his own business, when all of a sudden he experienced a malfunction with his vehicle. After he was safely out of traffic, he called his brother, Tom, and asked him to come out and "rescue" him.

Shortly thereafter, Tom arrived, and after assessing the situation, said, "I can't tow you home..."  So Frank said, "Ok, I'll tow you home."

How is it that Frank broke down, Tom couldn't tow him home, but in spite of his malfunctioning vehicle, Frank was able to tow Tom home?

What happened to Frank's vehicle that prohibits Tom from towing him, yet still allows Frank to tow Tom's vehicle? 

[Janet Nunziato]

I have no idea.  This just makes my head hurt!  Sheesh!