Today in 1969, Leonard Kleinrock and Charley Kline sent the first message over the ARPANET, the predecessor of the Internet, from their network node at UCLA to Bill Duvall at SRI.
Kleinrock and Kline attempted to transmit the word "login," as in logging into the SRI computer from their computer at UCLA. They succeeded in transmitting the "l" and the "o" and then the system crashed! Hence, says Kleinrock, the first message on the Internet was "lo", as in "lo and behold!” They were able to do the full login about an hour later.
Kleinrock: “Morse and Bell were a hell of a lot smarter than we were. They knew they were doing something of historical importance. We were just engineers, trying to do a good job.”