Yeah, I’ve been there too. Just as bad is when you have kids and somebody asks you your kids name and you block on it and then you just know they are thinking “what kind of parent forgets their own kids name?” I’ve learned some crutches / techniques when I get caught off guard like this. Nothing magical, just takes practice and experience. Or if that doesn’t work sometimes I just have to smile or laugh when I get stuck. It helps to ease the tension.