There was a crack on something one time, and my friend and I couldn't decide between that and duct tape so I just said "Why don't we just use both?" he laughed and we did it.
NOOO!! NOT FLEX TAPE!! I WANT DUCT TAPE!! GOT A LEAK? FLEX TAPE WILL FIX IT! SEE? FLEX TAPE FIXES IT!! AUSSIES: MATE, WE USE FU**ING DUCT TAPE! NOT THAT CRAP!