False: I have never visited a prison, although I have visited a few psychiatric hospitals. There's an odd sort of overlap there....
O-negative is the universal donor -- it has none of the factors (expressed A, B or +) to which one could be allergic.
Anke, are you a blood donor?
The person below me might get desperate and and grab any old thing to read on the way to the toilet -- Bed Bath and Beyond flyer, blender instructions, husband's impossibly boring computer magazine, etc. -- you know, just in case.