Operators and engineers in the chemical process industries who are responsible for the daily operations associated with sludge dewatering and drying equipment are undoubtedly aware that wastewater-sludge drying is not an easy task. A large number of the problems that arise during these operations are due to the sticky phase of sludge, which makes the drying of sludge as much an art as a science. Although insight into the sticky behavior of sludge during drying processes is critical for successfully drying sludge in practice, the sticky phase of sludge is not a common topic in the standard engineering curriculum at universities and colleges. Providing more insights into the peculiar sticky phenomenon of sludge is the aim of this article. Further, an overview of applied strategies to tackle the operational issues related to the sludge's "glueyness" will be provided.