| Also you might want to consider this:
 RewriteRule ^joke/([0-9]+)/?$ http://www.domain-name.com/index.php?sbjoke_id=$1
 
 Note the ? sign after / and before $
 
 It should look like this:
 
 RewriteRule ^category/([0-9]+)/?$ http://www.domain-name.com/index.php?sbcat_id=$1 [R]
 RewriteRule ^joke/([0-9]+)/?$ http://www.domain-name.com/index.php?sbjoke_id=$1 [R]
 
 This way you need only two lines instead of four but get the same functionality...
 
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