Time Turner: Did you just have a fight with your significant other and wish it had never happened? Ever say something you didn't mean and wish you could take it back the next second? Yeah, us too. The Time Turner gives you the ability to make that very problem disappear. The device, which looks like an hourglass with a gold chain, gives the wearer the ability to travel back in time and change events that have already occurred. Extensive use of the Time Turner in a relationship could also serve as a red flag—if you're constantly saying or doing regrettable things, you might want to reevaluate. Read: How To Fight Like a Wife
Pensieve: The Pensieve may look like a simple stone bowl filled with a silvery liquid to the average muggle (or person sans magical abilities), but in reality contains people's memories, leaving their minds free for other things. Furthermore, once put into the pensieve, anyone has the ability to go into the memory again and relive the moment exactly as it happened.
The Pensieve would be a gold-mine for relationships. For one, any memories you'd rather forget about your past lovers can instantly be removed and placed into the Pensieve. Plus, this contraption could be used to win arguments time and again with your spouse, provided your memories are correct of course. He doesn't believe he promised to make dinner tonight? Suggest he take a trip down memory lane to prove your point. For those nostalgic users, the Pensieve can be used to relive your wedding day, anniversary, or even that really amazing romp you had last month, moment by moment.
Sneakoscope: Your leftover pad thai from dinner last night is missing, and your husband claims to have "no idea" what happened to it. Enter the Sneakoscope, which lights up, spins and whistles whenever anyone is doing something dishonest. Unfortunately, the Sneakoscope doesn't reveal what's being lied about, so you'll have to assume it's about the food and not something else—like how he really feels about your mother's upcoming month-long visit. Read: Why I Cheated