I have met several of my friends as a consequence of wearing a tie.
The first (male) liked the picture on my tie and asked where I bought it.
The second (female) said she liked my tie and asked if it was silk, which it is. She then asked if she could stroke it.
Also, to prove that real geeks wear ties:
"Tie knots, random walks and topology" by Thomas M.A. Fink and Yong Mao, Theory of Condensed Matter group, Cavendish Laboratory, Cambridge.
Published in Physica A, vol 276 (2000) pages 109-121.
http://www.tcm.phy.cam.ac.uk/~tmf20/TIES/PAPERS/paper_physica_a.pdf
They proved that there were 85 different ways to tie a tie, including six that were previously unknown. The Institute of Physics declared this one of the top 10 physics highlights of the year.
This work also resulted in an invitation to write a book:
"The 85 Ways to Tie a Tie: The Science and Aesthetics of Tie Knots" by Thomas Fink and Yong Mao, Fourth Estate (Harper Collins), ISBN 1-841-15568-3