Poor Zac Hanson! The youngest Hanson brother has had his share of run-ins with unruly fans recently, but the one yesterday (Sept. 30) has got to be considered the worst.

Zac, who last month stopped a concert mid-song to tell off a heckler, had to kick a guy off his tour bus in Seattle last night, and TMZ captured the whole ensuing incident on video. The guy gets physical, grabbing Zac's leg at one point and trying to drag him off the bus with him. Zac manages to free his leg, but then the guy actually spits in the star's face.

It is beyond gross. The spitter's face can be seen clearly in the video as he walks away swearing. He even looks a little proud of himself, unbelievably.

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