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You might see a jump in your next electrical bill...
Lying? Absolutley not. Forgetting to mention something? Perfectly understandable. BUt then again if leaving the cover off a hot tub for a few hours will cause a major probelm with your spouse, then I think you might have bigger concerns in your relationship.
No Kidding. Talk about creating much ado about nothing. How was anything harmed by simply leaving a spa uncovered for 3 hours on a warm day? Was the spa hurt in any way? Doubtful. This was such a non event, in my opinion, that it doesn't merit being even brought up in a coversation. If you left the TV on while you were out and didn't tell your spouse about it, would that be lying? Same exact type of thing..