A word of warning

Yesterday I was standing outside the office, the door was open, when suddenly a gust of wind attempted to blow it shut and lock me out. The old "lightning" reflexes jumped into action and I swiftly and accurately thrust my right leg forward to halt the doors' progress. There was a twofold result.
1. The door was successfully kept unlocked.
2. I lacerated both sides of the ankle as it came under pressure from on one side the (metal - ouch) door, and on the other a rather sharp edged brick wall.

Anyone who's been at Taekwondo for a while has probably found themselves operating light switches, opening doors etc with knife hand techniques, or worse with their feet. Anyone who hasn't and is reading this probably has their mouth open in the sheer stupidity this would appear to imply.

I just hope when it's really important, the reflexes operate properly.