Brock Lesnar returned to Raw, proceeded to get hit with an RKO literally out of nowhere

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Brock Lesnar returned to Raw Monday night as Paul Heyman talked up his match against Randy Orton at Summerslam, slated for August 21.

But Orton, who was drafted to Smackdown and isn't supposed to just show up on Raw, wasn't having any of it and laid out the former UFC champ with an RKO literally out of nowhere.

According to Paul @HeymanHustle, the voices in @RandyOrton's head should be warning him about #SuplexCity! #RAW https://t.co/tITe0WiTPV

— WWE (@WWE) August 2, 2016

What was once a pretty lukewarm billing of a match has been turned up in recent weeks. And it only should get more interesting on the shows leading up to the big event.