Yes, I’m being lazy tonight. Just a link to a ToolCrib.com post tonight: The Laser Guided Hand Saw (and 6 Other Stupid Laser Tools).
These go in the category of “Just because you can, doesn’t mean you should.”
Other things that belong in this category: PowerPoint slide transitions with screechy tire sound effects, and websites that automatically play bad midi music upon visiting (They still do that??? Reminds me of high school days!), just to name the first two things that popped into my head. And… For that matter splashy flash intros that take an eternity to load and play.