Spencer Pratt didn't exactly get the V.I.P. treatment when he stopped by The Late Show the other week. And last night, Dave Letterman reiterated his dislike for the Hills star by pronouncing him "wormy" and "oily" (among other things) while chatting with Full House alum Mary-Kate Olsen. But it turns out Spencer and MK Olsen go way back! Check out this video clip (tune in around the 5:00 mark) to see what the former Michelle Tanner has to say about what tweenage Spencer was like in high school.