Herodias hated John the Baptizer for pointing out that she was an adulteress (Mk 6:18-19). When she said she wanted John's head, her daughter took her very literally, added on to her request, and asked Herod: "I want you to give me, at once, the head of John the Baptizer on a platter" (Mk 6:25). Herod granted her request. So a waiter walking around with John's head on a platter may have been part of the "entertainment" at Herod's birthday party.
To put it mildly, Herod was warped. He was warped in and by adultery, and in and by murder. When Herod later heard of Jesus, he projected his perversion and misidentified Jesus. "Herod exclaimed, 'John, whose head I had cut off, has been raised up!'" (Mk 6:16) Satan had twisted the mind and heart of Herod for many years, through sin after horrible sin, from adultery to murder, so that when Herod heard of Jesus, he would certainly jump to the wrong conclusion and live a Christ-less existence forever.
At this moment, many of us are being blinded, numbed, and warped by sin. In the near future, we may have our best or even last chance to recognize Jesus as our Lord and God. Repent now. Begin to return to reality. Jesus is coming soon. Don't miss Him.