Delivers shocking news to

• Delivers a haymaker
• Strikes speechless
• Cold-cocks
• Hits with a Star Trek phaser set on low
• Knocks for a loop
• Bedazzles
• Surprises big-time
• Astounds
• Leaves in awe

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: stun )