"A towel...is about the most massively useful thing an interstellar hitchhiker can have. Partly it has great practical value...More importantly, a towel has immense psychological value...anyone who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is, is clearly someone to be reckoned with.
— Douglas Adams, The Hitchhiker's Guide to the Galaxy
@francoise :)