Full-Screen Slideshow in Mountain Lion

Its amazing the hidden gems that are hidden away in Mac Os that I am still discovering.To do this, select all of the pictures in the Finder that you want to view, then hold down the Command+Option (alt)+Y keys together to create an instant Full-Screen slideshow of the selected images.Pressing the the small tile is also rather nice, and shows an index sheet of all the images that you have selected for the slideshow.