The time has come to execute the plan. Trevor would make an excuse to go to the office, while David sneaks a grenade in Trevor's jacket. They would take Zach's clothes and then become disguised, take the money, and run.
Trevor said to the guards, "I made poopoo! Hehehehe!"
"Oh great. We've got a code brown over here."
Now was David's chance. He snuck into Zach's office.
Zach was reading Becoming a creepypasta by Cody.
"I've got a grenade!" David yelled.
Zach turned around.
He pressed a button and knives came out of the walls.
In an eerie British accent, Zach said,
"This, is a knife party"