Giant Hogweed is one of those plants that can cause really severe reactions in people who are sensitive to it. And the only way to find out if you are sensitive to it is to handle it. You'll know soon enough then.People who are not sensitive to it can rock up to a patch shouting "Who's a wannabe triffid, then?" and the poor Hogweed will just hang its umbels in embarrassment.
Drop a thoughtful pebble in the comments bowl