Using bold becomes an issue (as I've found out personally) because it actually makes the space glyph slightly wider, even under fixed-width fonts, so you would end up with text not properly aligned where it otherwise should be. You should use either underline or reverse codes as shown above, because they don't affect the spacing or size of the whitespace.

- argv[0] on EFnet #mIRC
- "Life is a pointer to an integer without a cast"