Homesick--Contagious?

I just walked by the playroom and heard the girls playing Barbies.  This is what I heard:

Lyric: "Well we will have to see our kids."

Story: "I don't have any kids."

Lyric: "Yes, we all do.  Remember, they all went to college?  But then they all got home sick and had to come home."

Story: "I guess it was contagious."

Lyric just laughed.

Note to self, Story knows what contagious is, but doesn't know anything about being homesick:-)