Spanish moss (tillandsia usneoides)
Honestly, these things are amazing. They just keep draping down and look so much like hair! Being air plants, they don't have visible roots or anything so can just be hung anywhere to confuse people - we have one hanging in the shower and it makes the dark bathroom seem so much more lively.
Our plants are at least 30 cm long and come with little hooks so you can just hang them anywhere you like.
Looking after them is pretty easy - give them a good misting every now and then and also dunk them into a bowl of (preferably rain) water for about half an hour every month and they will be happy.