A pretty burn down chart usually means ugly Scrum

Why you should be worried if your burn down charts are perfect

Many Scrum Teams examine their burn-down chart at every Daily Scrum. When we’re below the perfect line, life is smiling at us, and things are going great! When we’re above the imaginary line, worry starts entering our minds.

“What if we won’t be able to complete everything in the Sprint?” We pray things will be better tomorrow when we examine our burn down chart together again.