pops up, and you can use it to keep the original formatting or to match the destination formatting (that is, the formatting you've chosen for your cell). However, if you're like me (or want to be like me — aren't you sweet), that is just too many steps if you know that you want to match the formatting of the cell. This is especially true if you have a lot of cutting and pasting to do.
To paste text from another program and keep your cell's formatting
Select the text you want to pop into your Excel worksheet.
Press CTRL+C.
Switch back to Excel.
Double-click in the cell, and press CTRL+V.