You say tomato, I say tomato. Interpretation - "rulings" not "rules"
I ran a game a few weeks ago where the party was fighting an invisible stalker. They knew it was close, but they were not sure where it was. One of the players had a pretty cool idea. He wanted to take out an oil flask and light a torch. Then he wanted to spray the oil out so that it would splash a larger area and light on fire. He didn't care at all about damage. He just wanted the oil to stick to the invisible stalker and give them a better chance to see it. I ran with it and made the stalker make a dexterity check instead of having the player roll a to hit. The stalker failed so I ruled that the flaming oil splashed on it and did 1d3 damage and would burn until the stalker's next turn. This gave 2 or 3 of the other PCs a chance to attack it without disadvantage. I thought it was a pretty cool idea and it played well. It was a "ruling" not "rules" decision.