Hiya,
It's very rare for any weepers or spots of red to be left after I finish shaving, and almost all mistakes have been user error related. However, there's a few razors that don't fit me well, and will leave a couple red marks no matter how careful I am. No, these aren't extremely aggressive ones, but rather they present the blade to my face at a bad angle that no technique tweaking will help overcome.
Saying that, the worst bloodletting occured a few years ago when using a razor I'm quite familiar with (the Kirby). Through not paying attention (and not a little hubris), I managed to catch the end of the blade on my chin and I somehow managed to quickly dig out two nice divots at the same time. This was in an area I never ever cut myself, and I was pretty surprised at the damage I'd done.
Heh, forget about that liquid styptic (My Nic is Sealed) doing any good. Those damn cuts bled for a looong time and took a good week to heal up. That's exactly what I deserved for not paying more atention to detail.
Sheeesh,
Martin