Kids are like travelbugs

Travelbug

According to geocaching.com, a travelbug is a "trackable tag that you attach to an item. This allows you to track your item on Geocaching.com. The item becomes a hitchhiker that is carried from cache to cache (or person to person) in the real world and you can follow its progress online." Good geocaching etiquette says that you don't keep a travelbug for more than two weeks. 

So tonight on the way to a geocaching site, Isaiah said, "Kids are like travel bugs.  You keep them for a while.  Then you let them go."  I said, "Let them go?"  His reply: "You know.  When they go to college."