Love Warhol, Lichtenstein. Haring sometimes (but sometimes it looks cheap, imo). Pollock's works fascinate me- just get a kind of falling-in sensation, coupled with mixed emotions and perceptions. Weird.
Went to the Met quite a while back (15yrs?). The best reaction I had to anything in the building was unexpected: Charles Demuth's "The Figure 5 in Gold". It was amazing.