Slice an avocado into thin but not-too-thin segments. Fan out on a plate. Douse in soy sauce, then sprinkle liberally with freshly ground pepper. Provide toothpicks for spearing.
I also love them in sandwiches. When I lived in Iowa City, home of the marvelous New Pioneer Co-op (which was only one of the many reasons it was much easier to be an almost-vegetarian there than in NW PA), I liked ordering the vegan Rock & Roll Avocado Tofuwich (scroll down to find this sandwich). I tried recreating this sandwich myself, and made an acceptable substitute. And then I just started making avocado sandwiches.
Currently my favorite sandwich is this:
Avocado and Jam Sandwich
two slices wheat bread
one half of an avocado
white cheese of your choice; I used swiss for a long time but currently prefer a nice sharp cheddar
Spread the raspberry jam on one slice of bread. If you want to melt the cheese, put it on the other slice. (I melt the cheddar but didn't melt the swiss, mostly because the swiss came in big slices but the cheddar I buy comes in little wedges and the slices fall off the bread unless I melt them.) Mash or slice the avocado up and spread over the cheese if melted or on the other slice of bread if it's not melted. Sprinkle cinnamon liberally on the avocado. Smash both sides together and eat.
The flavors are all fairly strong but they blend together well. It's really good. I think I'll make one right now.