Which type of cut joins a point-of-view shot of a person looking offscreen with a shot of the object of their gaze, as found in this clip from spam-ku?

This cut is called the Eye-Line match cut. It is based on the premise that the viewer desires to see the object of interest of the character. Thus, the cut guides the viewers attention towards the "line" between the eye of the character and what he is ultimately looking at.

Alloy of metals is the answer