This is a fun gem that actually made me laugh out loud when I found out about it.
Have you ever gotten really mad at an application and just wanted to blast a huge hole in it? With blast that is exactly what you can do. Use your system's preferred package manager to install the blast package.
Now, when you get angry at an application, just hit Alt+F2 and type blast. Begin clicking away to shoot holes in the windows. Middle-click to "repair" the window, and right-click to exit. Beware, if you forget to repair the window before you exit blast, the changes will stick until you close the window.