Itsy Bitsy Spider
I love plants, and although they do necessitate a bit of awareness that some people don't possess (I have definitely lived with people who regularly forgot that they owned live plants), if you give them a bit of semi-regular TLC (ie water!) they are likely to do just fine.
If you are new to the plant world, let me introduce you to the spider plant, which, outside of the cactus family is pretty much the definition of an easy keeper. They are named so because of little 'spiderettes' hang down from the mother plants like spiders on a web. Considered one of the most adaptable houseplants, you can grow it from little baby pots, or cuttings from the mother. They don't need a ton of watering, and can live in direct or indirect sunlight.
I snagged a few of these spiderette cuttings while I was out one day, and to begin have kept them in a small glass of water (as they are able to grow in water until their root system is established). Once they are a bit more mature, I will transfer them to a pot so that they get the nutrients needed to grow nice and big. One of your friends is almost guaranteed to own one, so next time you are over, just ask to adopt one of their little babies off the mother plant, and grow your own green family!