Everything and everybody casts a shadow when it blocks the light. Shadows taking different shapes is a common thing; this happens when things block light at different angles. The most common thing happening with shadows is either they are very large than the actual body, or they are smaller than the actual object size. However, shadows can take a funny turn when they look exactly like a different object altogether.
Here is a list of objects whose shadows look like different objects. You will be very surprised to see some unexpected objects casting completely unexpected shadows that take shape of different objects. Upvote your favorite shadows while you scroll!