As we all know a porcupine can shoot its quills for some distance when threatened.

At age 14 that's what I knew. WE DON'T HAVE PORCUPINES IN ENGLAND.
Twycross Zoo on a school field trip.
The porcupine enclosure is a sunken pit sans fencing.
I, so brave, jumped down into the enclosure and picked up 3 discarded quills and smartly jumped back up out of the enclosure with no quills being fired at me.

It wasn't until Nov 1993 that I saw my next porcupine on the road up Mt Greylock, MA
I did not try to take any of its quills. In fact the poor bugger looked rather cold, infirm and old.