If you've ever wanted to anger the know-it-all in your office/class/social circle, the Wrongulator may be the perfect way to do so. These special calculators look exactly like regular calculators, except for the convenient fact that they are designed to get any mathematical calculation entered into them absolutely wrong. The results are just complete nonsense.
For approximately $7 US, you can sit back and watch your friends become utterly infuriated by things like "10 + 5 = 10." Does anything sound more fun than that?
While the Wrongulator would be an incredibly irresponsible and unwise prank to pull at, say, the payroll department in your office, it would certainly be hilarious to watch your co-workers struggle with this manipulated calculator.