So your friends are wise to you - they won't come over to your house anymore in fear of a slideshow breaking out. You can't just keep those Kodachrome slides of your trip to the canyon and your gall bladder surgery to yourself. You're a natural showman! IF you forgot to bring your Minolta pocket sized 35mm slide projector, you can always whip out your Arrow-View pocket viewer.
With a heart made of two C batteries and a flashlight bulb, there's not a lot of tech going on here, but you've still got just about everything you need for a slide show - one slide at a time, of course. Just drop the slide in the slot and push down. The slide pushes a contact into place, and the rear light fires up. The bottom knob physically moves the magifier to adjust for any level of focus and/or myopia.
Of course these days practically any MP3 player can display a much more elaborate multimedia slideshow. This viewer hearkens back to somewhat more "monomedia" times. I still think this is a kicky little slide viewer - especially the mysterious marble-ized finish and the shape reminiscent of a camera. It's no smartphone powerhouse, but at least the 50's were trying.