Admiral “Jackie” Fisher was a major historical figure in the Royal Navy, advocate of the modern dreadnought battleship and a tad high-strung (“…and on one occasion, the king asked him to stop shaking his fist in his face”). His relationship with Winston Churchill at the Admiralty must have been something to observe, as two of the most influential men in London worked together (for a while). After leaving the Admiralty for the last time, he still kept in touch with Churchill. Here is an example of his communication style:
This is believed to be the first documented use of the now familiar “OMG”.
H/T to Shaun Usher.