That I'd be able to handle a terminal diagnosis well. I had cancer a few years ago and was told (based on scans) that it had metastasized to bone and the chance of survival was basically nothing. I was rather indifferent to the whole thing and didn't even tell anyone else. But yeah, I just shrugged and went on like normal, not much I could do about it.

It was a good thing I didn't tell about it, though, because later scans revealed that the cancer hadn't actually metastasized to bone, that I just had sclerotic lesions on some of my bones for inexplicable reasons... And my cancer was later 'cured'. Would have bothered my family and friends a lot more than it bothered me and caused a lot of stress for them for no reason.