This is why we do this

Standing on the street in albany, trying to decide where to go, a veryold woman walked up to us.  The following conversation is mostly word for word;  Lady "How old are you guys?"  Us "Mid thirties, mostly".  Lady "I'm not sure I should tell you guys, but I was in California and heard this joke."  Us "Ok"  Lady "Why did the fish get kicked out of school?"  Us "Why" Lady "Because it was caught with sea weed."    Thank you lady