Tom, Things that make me smile like a madman: First a couple of work related ones I'm an engineer and if I have specified something huge (you know £millions) and I finally see the finished product working / helping people with their daily lives :D Alternatively, I help junior engineer's get their full qualification level (Chartered Engineer) and when they finally get their CEng :D) For non work ... I'm with petoskystone - the sky from a dark site with a telescope / binocculars to hand ... Bliss