I don't have any.. but I have learned something today.
"in 2001, Dr. Karl Kruszelnicki of the University of Sydney, Australia undertook a systematic survey to determine the ins and outs of navel lint. His primary findings were as follows: Navel lint consists primarily of stray fibres from one's clothing, mixed with some dead skin cells and strands of body hair. The rotting cells can create unpleasant odors. Contrary to expectations, navel lint appears to migrate upwards from underwear rather than downwards from shirts or tops. The migration process is the result of the frictional drag of body hair on underwear, which drags stray fibres up into the navel."