Superboy and Supergirl would love to celebrate, but first they've got to give Darkseid a message ...
... the 20th Century says "have fun getting sucka-punched!"
(Also, the future belongs to Bahlactus!)
[From "Darkseid," in The Legion of Super-Heroes vol. 1 #294, December 1982. Co-plotted and pencilled by Mr. Giffen, co-plotted and scripted by Paul Levitz, inked by Larry Mahlstedt, colored by Carl Gafford, lettered by John Costanza.]