I was sitting on my computer chair, with my left leg crossed under my right one, my left arm almost resting in my right armpit, and my right hand on my mouse at my computer desk. I was leaning back and to the right on my arm rest a little bit, which isn't the best posture, but it was comfy.
Sitting on the futon with my legs crossed and my laptop on my lap. My hands are in my "lap" where the laptop is, resting on the touch pad with my index finger on the left mouse button and the middle one performing the scrolling action.
I am sitting straight up, with proper posture. My left leg is bent at the knee beneath the right leg which sits atop my left ankle just above the right knee.
Right now I'm slouched in my computer's chair with both feet on the case full of cassette tapes under the desk. My hands are positioned on the keyboard and mouse. Most of the time I have one foot under my thigh and I sit more upright, but now I'm pretty tired and rather be lazy.
I'm sitting on my bed with my laptop on my lap with my legs folded beneath me Japanese style, occasionally shifting to keep my blood circulation flowing. I'm leaning back propped up by a pillow behind my back, slightly uncomfortable but too lazy to move to a more comfortable position lol. My hands are on the keyboard while typing this (of course), and when I'm not typing, my left hand's middle finger (it's more comfortable than my index finger lol) would be positioned just above the left mouse button ready for action while my right index finger would be on the scroll bar on my touch pad performing the scrolling action.