Shakeproof Washer

Arsehole. If you're not familiar with shakeproof washers, take a look at the tow ball on your car where it attaches to the towing bracket. You will see two large bolts fitted with what looks suspiciously like a human sphyncter.

Nigel, I think a trip to casualty may be in order as my shakeproof washer seems to have an inhuman grip on your spam javelin.