Search for something in Help.
Press Ctrl+F to bring up the control that lets you jump to the next/previous result.
Type in something else to search for that will surely be found several times.
Click through the next few results and eventually you'll find one that causes the Help window to scroll and the search hit will be hidden under the drop-down control where the Next/Previous buttons are.
Sometimes it's even worse than this example and you can't even see that there's anything hilighted at all until you click the X to hide the drop-down control. I won't bother showing you a screen shot of that because it wouldn't prove anything.
