Clearing Something Up
Communication through text messages can sometimes lead to misunderstandings due to the absence of vocal tone and facial expressions.
For instance, interpreting a "hehe" as a light-hearted giggle is common. However, this person wanted to emphasize that their "heheheh" had a somewhat more sinister undertone. If you were uncertain about the exact tone, you could consider this peculiar picture of a dog as an illustrative example.