I hated spelling test growing up. I had spelling test from elementary school to high school. I was always pretty good at spelling but having spelling test really has helped me with my literacy journey, despite how much I hated it.
Another pinner says: How Many Drops of Water Can a Penny Hold? My daughter did this as her science fair project last year and it was very popular. She even used water variations (Kool-aid, salt water, etc).