Sonchus arvensis or something similar.
Some people see Japanese Knotweed or Giant Hogweed in every plant they don't know.
They might just mean 'pull it up quick before it seeds everywhere'
I suppose you could stab yourself whilst trying to dig it out.
There speaks a doctor!
OH RIGHT, MISSED THE SPIKE.
I WAS AT THE BACK OF THE QUEUE WHEN THEY WERE HANDING OUT EYES.
IF IT'S A SOW THISTLE YOU COULD SING IT THIS LITTLE SONG TO LULL IT TO SLEEP.
Haven't heard that in years