Guys and gals . . . can anyone here remember the beginning days of "DHTML", and a little open source project launched by Macromedia called Superfly?
If anyone is familiar with Felix and Superfly you will see the connection. I've often pondered how easily this can be added to a web page. It would involve a series of stored "animation paths" incorporated with a few stored functions and would heavily use setTimeout() to execute both the animation "scenes" and the speed of their movements.
In the Windows version, as Felix moves across the screen, you can click him, pick him up by the scruff of the neck, and drop him onto desktop objects, such as open windows. Felix will then move into "walk mode" until he reaches the edge of the box, then "jump" down until he hits another walk object, return to walk mode, and proceed off the screen. You can switch between the "scruff," "walk," and "jump" animated .gif's by a combination of onMouseDown/onMouseUp and collisions between the object containing the animation and the coordinates of the user's mouse in the click events.
A more simple project, a few passes across the screen or a couple reactions to a click, even *I* could do this within a few hours.
However, one must consider the dollar value of "cute," and also whether or not this would contribute anything of value to your site visitors. "Stupid web tricks" (pardon the pun, sorry) hold a very small value if they don't contribute to the visitor's experience in a way beyond visual effect.