A bit OOT: During my early days of programming back in high school, I found Visual Basic 5 CCE (http://www.thevbzone.com/vbcce.htm). Having previously used Turbo Pascal, I was quite mesmerized by the UI designer/drag-n-drop. I spent countless of hours making pretty UIs, and I just love clicking buttons (esp. watching the "sunken" effect).

Of course, since I was an idiot, I didn't know that I can't produce .EXE using VB5 CCE.