Barack Obama sparked joking rumors that he was on his way to find answers to Kate Middleton’s mysterious disappearance from the public eye when he was spotted at 10 Downing Street this week. The former POTUS reportedly paid a visit to U.K. Prime Minister Rishi Sunak while at the famed residence. The reason behind his trip is unknown, but users on X — formerly known as Twitter — had no problem coming up with wild explanations. “BREAKING: Barack Obama has arrived in the UK to find Kate Middleton,” one person wrote, and a second quipped, “If he can find Osama [bin Laden], he can find anyone.” “Ob…