Tradeoffs

The boys were tossed out of the ball pit for rough-housing.  The wife began to sternly lecture them "Why are you so wild?  Don’t you know you could get hurt?!"  The 5-year old retorted, "Mom!  No risk, no fun."

Naturally I burst out laughing.  Need I explain why this was not wise?  I should have kept quiet, but I learned another tradeoff; no fun, no risk.