my worst was a double-date with my mate and his girlfriend and her friend who I really liked but who was only around for 3 more weeks before going abroad for while. lunch was great, we drank a fair bit, and at one point I asked my mates gf why I hadnt seen her for a while, "Oh Ive been ill, but I'm much better now". "Eww you're not contagious or anything are you?" I asked half-jokingly "Hehe no its fine" she said.
I dont know if any of you have had chickenpox as an adult but I wouldnt recommend it. The next day my body decided to get rid of anything which wasnt firmly attached, couldnt keep even water down for 3 days, didnt eat anything for over a week and spent another 2 weeks recovering. She met someone on holiday. Brilliant.