Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 16292)
+++ wp-includes/functions.php	(working copy)
@@ -2637,9 +2637,9 @@
 			}
 		}
 
-		return apply_filters( 'explain_nonce_' . $verb . '-' . $noun, __( 'Are you sure you want to do this?' ), isset($matches[4]) ? $matches[4] : '' );
+		return apply_filters( 'explain_nonce_' . $verb . '-' . $noun, __( 'The link you have followed has expired.' ), isset($matches[4]) ? $matches[4] : '' );
 	} else {
-		return apply_filters( 'explain_nonce_' . $action, __( 'Are you sure you want to do this?' ) );
+		return apply_filters( 'explain_nonce_' . $action, __( 'The link you have followed has expired.' ) );
 	}
 }