Chef Ramsay Bangs his Head

In Season 4's third service, Jason Underwood was unable to keep his souffles from sticking to the cups, and mentioned to Ramsay that he was going to try brushing sugar and cocoa around the rim to prevent this (for those of you that don't know, this is the first thing you're supposed to do when cooking a souffle). After hearing this, Gordon stood there slack-jawed for a few seconds before going to the counter in between the kitchens...and bashing his forehead against it repeatedly.

Example of:
Head Desk