My first boss taught me to always carry a whiteboard marker with me to client meetings. If you had a marker, you could accomplish great things (assuming there was a whiteboard in the conference room). 1) you could better illustrate your thoughts, 2) you could capture brainstorming ideas, 3) you could outline responsibilities and next steps, and 4) you could direct the discussion. All while showing your value as a leader. Excellent ROI on a $1 marker.