Dumb Date for two

Asked my wife to set up her dumbest single friend, Gina, to go on a date with my dumbest single friend Ralf. Gina shows up and Ralf says I like your blonde hair, is that natural. Gina replied: No, I wore this wig for our blonde date....how did you know? Ralph takes off his dark glasses and folds up his guide cane and says, oh, sorry, I thought it was a blind date