You may be asked to help someone negotiate a difficult situation or challenge.
A river may seem calm on the surface, but deep beneath it can be moving and turbulent. People have underestimated your calm exterior, and they have not realised that beneath it all you are very active and very aware of what is going on around you. They may get a very sudden surprise when they realise that you know what has been happening all along and that they have not been able to fool you.
Facts and figures that demonstrate specific achievements will make your resume or monthly review meeting stand out from the crowd.