Does anyone else get royally pissed off by people with extremely poor umbrella-handling skills?

Being six-feet tall, a lot of people I encounter are around "umbrella tip" height. How can you not see me coming??? Please can you just raise your brolly slightly to prevent me from having to wear a pirate-style eye patch for the rest of my life?!

Can anyone suggest an effective way of combatting these brolly-warriors?

The only thing I can think of is wearing a goalie's hockey mask on the way to work. Though people may give me a wide berth that way anyway...