If you drop a condenser mic, the diaphragm (the part that vibrates to create sound) could be damaged. This will cause the mic to produce a lower quality sound and may even stop working completely. Dropping a condenser mic can also cause other internal components to break, which will make the mic irreparable. It's always best to be careful with your equipment and to handle it with care, especially if it's a valuable piece of gear like a condenser mic.