K and N, or maybe the triangular self-destructing filters in the airbox?
Pad bit off a plaster?
Polishing cloth (I have no idea if it is as I am not sure what one of those looks like)
Gimp gag?
Rohypnol pad?
Cornplaster designed to go between the fifth and sixth toes?
Sling or shoulder reinforcement/gammy wrist padding?
Inside of a bike glove?
Wadding from a shotgun cartridge, or blank cartridge?
Frank's knitting/crocheting/codpiece?
Webbing from between one of your "close" relative's fingers?
The only part left intact from one of Kev's love trysts with a herd of black-faced sheep after 20 minutes?
If it's not one of those I'm out, too.

It's not falling off, it's an upgrade opportunity.