Whats a good scene for a movie about a boy having a disease that is like alzhiemers?

Whats a good scene for a movie about a boy having a disease that is like alzhiemers? Me and my cousin are making a movie, but we’re a little stuck. We’re writing the script and we have only 3 scenes done. The disease is really schizo or something near that spelling . We’re looking for something suspenseful and not expected.