To forget that one is holding down a
key on the keyboard. When performing unusual or complex keypress combinations, it is easy for
one to actually forget one is pressing a
key, and keep it held down with their finger. When this happens, they may believe that their application is glitching by continually performing
one action, such as printing a long line of "
z". Depending on the situation, it may actually take a few moments for the user to think about the problem and find the solution to it.