Why does rewrite rule ^(.*)$ set variable $1 to index.php

I have rewriting enabled.

I go to domain/bar and expect it to be rewritten to domain/index.php?foo=bar but I get d开发者_StackOverflowomain/index.php?foo=index.php instead :o

RewriteRule ^(.*)$ index.php?foo=$1

Why isn't $1 set to bar?

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This works fine for me, try it:

RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?foo=$1