Oh yes, definitely try to put together a show for friends.

Practice for an evening. Pick a few favorite songs/tunes/classics and scratch out time notes. Allow 5 seconds approximately per slide. Give or take. If one slide is not as good as the others give it a couple seconds (some duds you can't toss because they are needed for continuity). The great, dramatic slides get about 10 seconds maybe even 20 if they are truly stunning.

It's such a blast when you get the timing right and the rainclouds come in when the cymbals crash...