Tits and knives. That was my first impression of Chrissy the tour guide. Tits and knives. Today I consider her a good friend and colleague, but the thing about first impressions is that visuals make up most of it. And visually, the two things I noticed first about Chrissy were her tits and knives (ed. note: I told her this recently after I finished writing this, and she laughed and approved).  A smaller woman, about 5’3” I’d say, I first met Chrissy under the herb sign on St. Peters, as she was waiting to take out a tour. I remember she was wearing a low cut black short that intentionally…