"I will sometimes use breathing when in a stressful situation"
Yes. To add to 13's list, I occasionally cling to my breath in stressful situations or when someone is talking to me and I really need to pay attention. Not sure that it qualifies as meditating... just a useful modification of the so called technique.
"MRI scan... stuck in a tube for nearly an hour"
Yes again! That was difficult. Long and very narrow tube and you can't move your head enough to see out of either end. Very claustrophobic for about an hour. Had to wear a headset to communicate with the outside world. I focused on breathing because it qualified as one of those stressful situations.
