Decorating (with) eggs

I know it's not quite Easter yet, and I've never even seen a goose, but I still managed to give Mama a nice goose egg on her forehead today. I headbutted her when I was trying to get away from Daddy during our "Gotcha" game, and it seems that my head is a fair amount harder than hers. Although I have a red bump on my head, it didn't even faze me. Mama, however, couldn't see straight for several seconds.