Being impressed with yourself is a bit like being able to tickle yourself. I have no idea how some people seem able to do it.
Seems like the crucial ingredient of surprise would be missing. I'd have to be in a really unprecedented situation to potentially surprise myself.
Not the ones I’m thinking of. We may have different understandings of ‘impressed’. To me the element of surprise is definitional: exceeding expectations. If you expect that then your expectations just went up.