seemless interface design

From somewhere on the Web:

But look on the bright side, if the only time you hear about your software is when it breaks, take it as a compliment on your seemless interface design.

This is yet another example of what automated spell-checking won't do for you. A "seamless" interface is highly prized because it is a joy to use (no leaky abstractions). A "seemless", meaning "unseemly", interface is not so highly prized.

The moral: work on your seemless interface design until it is seamless.