My coworker always brings a ladder to the office.

This joke scales the heights of humor through its clever use of wordplay, specifically a pun. The setup, involving a coworker who always brings a ladder to the office (Review), builds a wonderfully absurd image. The punchline then delivers the comedic payoff by playing on the dual meaning of "take his work to a higher level." This phrase is typically a metaphorical expression for improving one's performance or achieving greater success, but the ladder introduces a literal, physical interpretation, creating an unexpected and amusing twist.

In the real world of work and office environments, the idea of "higher levels" is a common theme. People often talk about climbing the corporate ladder, aiming for new heights in their careers, or striving for professional excellence. This joke gently pokes fun at this aspirational corporate speak by taking it at face value. It's a playful commentary on how we often use abstract language in the workplace, and the humor comes from grounding that abstraction in a very concrete, and frankly silly, action.