Have you had this error while developing a Drupal site on a WAMP server?  Its common, and relatively easy to fix.

Fatal error: Maximum execution time of 30 seconds exceeded in C:\wamp\www\<mysite>\includes\database.mysqli.inc on line 108

One of the more annoying things in Drupal is that when you get a 404 error (ie, "Page Not Found"), all the menus disappear.

Its simply fixed, but IMHO it shouldn't need fixing... although its a hotly debated topic when someone brings it up.