From the "preventing the user from ever making a mistake by relentless confirmation dialogs every time he/she tries to do something" department, here's a screenshot from OpenOffice.org 2.0's spreadsheet. All I did was select a cell and press the "delete" key to delete its contents:
Yes, for the the love of God, I do want to delete the cell I just told you to delete, you ****ing [long chain of expletives deleted].
Honestly, what is this dialog supposed to accomplish? If I decide afterwards that I didn't want to delete whatever was in that cell, I'll use the Undo feature to restore it. (Maybe undo doesn't work in OpenOffice?) Even Microsoft Excel gets this right! Yes, software from Microsoft! It makes me want to vomit with rage (to borrow a line from the Simpsons.) Don't even get me started about the gratuitous incompatibilities between OOo Calc and MS Excel.
The only reason I was even using OOo in the first place was that the Windows version of Gnumeric was having trouble with the =chitest function, and I'm too much of a cheapskate (and open source weirdo) to buy MS Office for my laptop.