1. used for saying that an experience in the future will likely be different to how someone imagines it
Professional
Social
if you think that's easy, you will be in for a shock/surprise
The expression to be 'in with a shock' or 'in for a surprise' is usually used in a negative way in order to express that someone has an inaccurate view of events or is overly confident or optimistic about something which is likely to have a very different outcome than they expect.