Could also be poor form. Some people just yank the pump head off the valve stem. I lightly lube the pump head about once a month or so, when removing the pump head gets a little sticky. You should also pinch the valve stem with your other hand with either a presta or scharder valve.

The shop mechanic could have done this, you could have done this, or it was really a bad tube.

We all know it's George W Bush's fault.