Divine Thursday - Planar Binding: https://www.dndbeyond.com/spells/planar-binding
Planar Binding lets you summon and attempt to bind a creature from another plane to your service—a celestial, elemental, fey, or fiend. Because it’s a control spell it can work on creatures hostile to the caster; however, in that case the creature will obey commands to the letter but will do everything it can to twist them to its own advantage or its own purposes. So it brings in the whole tradition of being very careful how you word a request when a genie grants you wishes.
What is the most creative example you have seen when a player or DM used this spell? How would you use this spell as a caster PC, or how would you use this spell as a DM to challenge your players?