A Million Trillion

A couple nights ago Will was (as usual) insisting upon winning.   He had made up a pool game of his own and Sarah was kind of playing with him.   He was bragging about how he had a million points.   Tim started teasing him and said, "Well, Sarah has a trillion points."    Will says, "Well, I've got a MILLION TRILLION points!!!"   Tim responds, "Will, you don't even know how many zeros are in a million trillion.   Will thinks a second and says, "Eighteen" nonchalantly and continues to play.   He was right!!!