Some multiples lose the remembrance of common events, generally when asked about them without mental 'preparation'. Like their own birthday or a very special anniversary. It may take a few seconds to get the correct answer when attempting to retrieve the information. If an answer should 'pop in your head' take another second to consider it; occasionally the birthdate for someone else (inside or outside a system) is given instead. Rather embarrassing when that happens, people give many incredulous looks. It helps to look confused and ask them to repeat the question (if it was verbally given) to give you a few spare seconds to think.