Today's wah guitar lick is a more traditional example of the wah's use. It's a 70's kinda funk vibe aiming for a straight ahead wah sound. Using notes from the minor pentatonic try coming up with your own riffs using the wah and some string muting. In a rock context the ultimate example of a wah wah is Hendrix's "Voodoo Child (Slight Return)". In that song Jimi uses the wah to great effect on both the muted and non muted notes during the intro.