I don't use either expression, so I'm not sure, but to me the former (which I hate so much I can't type it) implies, "uh oh--I'm caught in the act, and I'm embarrassed", whereas the s-e one would imply, "I'm caught in the act and I'll suffer for it, but the wrong I've just done you was worth it, ha ha". Reminds me of a stubborn friend, who, at six years old, consciously decided that not getting to go out to recess was preferable to eating the school lunch on fried chicken liver days.