Caricatures are something I never do, but I think I might do more, after having finished this attempt. I don't think it was particularly successful (but fun, nevertheless.) The middle one kinda fell flat, but I'm not altogether unhappy with the first and third one.
They were done with marker, scanned and color added in Photoshop. Part of a caricature thread that has been going on for nearly a year and many pages, over at the Drawing Board forum.
(Please click image for larger version.)