Mine come from the name of a plant of the cactus family, a discret one which seems harmless at first look, but when you walk on it you quickly feel the pain.
I love making comparison between life and other subject (not only life but just compare objects/situations each other), and it's one of my favorite :
When you look at the life through the window, it look beautiful, happy and you want to go in this world, but when you go to walk on the life path without protection, there is pain at every step of the way.
It's like walking on a cactus, where one day = one step.
I also love the comparison with a waiting room at the hospital, you still here to wait the end, when doctor come, the wait take end and you are transported to another world.
But the waiting time is long, very long, you do what you can to keep you busy, you see the others leaving one after the other, sometime using the natural way when the doctor come, and sometime they just leaving the room by themself.
But "WaitingRoom" don't sound good for a username for me, so I prefered the cactus version for it.