Yes! and...

Saying Yess and... is a technique fro improvisation
Consider this post by Patty Walters reviewing a book by Patricia Ryan Madson:
http://improv4life.blogspot.com/2011/04/experience-adventure-with-yesand.html?spref=tw

Don't play it safe - play it Bold! Here's to living a "Yes" adventure!

YES! And...