 When Leslie said she has never received an MRI , Chris takes her to the hospital to receive one . Chris makes uncomfortable comments , remarking that Leslie has an excellent uterus ( " could easily have triplets right off the bat " ) and asking whether she is having her period , presumably in anticipation of sex later . Leslie rejects his advances when the date ends , prompting him to make an angry goodbye , even though Leslie still needs to give him a ride home . Meanwhile , Mark ( Paul Schneider ) grows suspicious that Ann harbors romantic feelings for Justin . He eventually confronts Ann and accuses her of trying to " save " Justin for a possible relationship in the future . Mark asks Ann 's ex @-@ boyfriend Andy ( Chris Pratt ) , who also recalls Ann 's infatuation with Justin . Andy scolds Ann for hurting Mark 's feelings , then tries to trick her into thinking she was still dating him , which does not work . Realizing her behavior was inappropriate , Ann sets Leslie up on a date with Justin . 
