Dwayne Johnson has been hyping up a Black Adam versus Superman showdown for over a month now. He has mentioned, in a number of interviews, that one of the unstoppable forces on Earth (Black Adam) will meet the most unstoppable force in the universe (Superman).
Well, a new promo video for the movie teases a showdown between the two superpowered beings. In the video, Black Adam hilariously sends an SMS to Superman using a green diamond emoji. This alludes to Clark Kent's weakness which is Kryptonite.
In the short video, Black Adam asks Superman if he knows what the green diamond emoji is. The then states that "it's another rock that can kick your a**!" The video subtly breaks the fourth wall by mentioning "it's another rock" which alludes to Dwayne Johnson's pro wrestling moniker.
The exchange ends with Superman stating that they need to talk. Black Adam asks "and why would we need to do that?"