Your a very naughty man Clipper !
Strangely enough out of all the bits and pieces I've packed in the car for trips to France in various tin tops over the years, Duct tape is the one essential I have had to use in emergencies and so I would count it essential
I had to use it to tape secure a headlight cluster that came out of an Audi A4 when my best friend accidentally reversed his Porsche into me coming out of a junction of a Campanile when on a skiing trip to France
And then again it became essential years later when my rear quarter light in an M Class Merc was punched through in an attempt to steal something from the car when parked up in a picnic spot in Brittany
It is so essential that for obvious reasons I never travel in the Mog without a roll of duct tape but pleasingly I haven't had to use it yet other than I use it to prop open the rear of the hood when I need to put the hood up