We've all yelled at our computers before, it can be very therapeutic, but we never thought it would do anything. Thanks to Brendan Gregg of Sun's Fishworks team, we know for a FACT yelling at your computer doesn't do anything helpful, and in fact increases latency.
Brendan wanted to see the effects of vibration on a disc array, so the best idea he came up with for improvised vibration was yelling at it. I'm glad I'm not kidding. What resulted (besides an incredibly hilarious video) was a sharp spike the number of I/O operations that take over 5ms to complete. Lesson learned: electronics won't listen to you.