I'm one of those people who faints all of the time, it's just how my body reacts to stress (and I have a heart/blood pressure thing) but it gave me this idea:
Matt Murdock is a fainter.
Maybe it's the blood loss from daredeviling, his spotty at best nutrition or his aversion to sleep but he tends to hit the deck. After years of friendship Foggy is used to it but the first time it happens in front of Karen she freaks out and is horrified that Foggy seems so bored with the whole scraping his best friend up off the floor thing.

Maybe do this as a 5+1, 5 times it was just Matts weird body and 1 time he was actually really sick (or something)