蹲在坟墓前唱忐忑盯着贞子唱忐忑
[dūn zài fén mù qián chàng tăn tè dīng zhe zhēn zi chàng tăn tè]
Combining dark humor, this refers to singing an anxious song called 'Tension' (or its English equivalent) while crouching in front of a grave or staring at Sadako (from Japanese horror). It's meant as a playful way to convey feeling unsettled or scared.