It may not be safe to set up actual indoor fireworks, but the Desktop Fireworks by Tomomi Sayuda make a pretty entertaining and easy alternative for small celebrations. Setting off the fireworks involves pressing a big red button, which will activate music, light, bubbles and confetti. To keep the effects as delightful as possible, Sayuda describes that "The button should only be pressed at times of extreme stress."
As much fun as the design of the Desktop Fireworks are, they address the rather serious issue of people becoming overworked and stressed out. Sayuda dedicated his unique creation to his father, designer Kenichi Sayuda, who committed suicide due to extreme stress at work back in 1995.