With well over 100 years of history one would think that there is absolutely nothing that can happen during a baseball game that has not happened before.
We've already had our first hit, our first home run, first triple play, first grand slam, etc. Players have been wearing sunglasses since 1882. Helmets have been worn since 1905. Someone’s pitched two complete games (and won both) in the same day (Frank ‘Yip’ Owen in 1905).