http://gizmodo.com/390304/earth-set-to-receive-alien-reply-invasion-in-2015

If all goes well—or very wrong—Earth may receive a message from aliens from the Altair solar system as early as 2015. Japanese astronomers Hisashi Hirabayashi and Masaki Morimoto sent an email there back in 1983, which was lost and has just been re-discovered by the latter at the Nishi-Harima Astronomical Observatory. Hirabayashi says they were drunk at the time, which explains why some of the 13 71 x 71 pixel images are the molecular formula for ethanol, the kanji characters for “kanpai!” (cheers!), and the English word “toast.”