When you accidentally cast stinking cloud at the table but your

Dungeons and Dragons (D&D) Fifth Edition (5e) Spell - Stinking Cloud - You create a 20-foot-radius sphere of yellow, nauseating gas centered on a point.. Stinking Cloud is a spell that releases a billow of noxious gas, expanding outward from the point where it is discharged. The cloud is greenish in hue and relatively thin, allowing line-of-sight to remain clear enough that attack dice are unaffected. Any breathing creature caught in the cloud, regardless of allegiance, must make a saving throw vs. poison upon entering the vapour.

Stinking Cloud From Player's Handbook, page 278. Description 3rd-level conjuration Casting Time: 1 action Range: 90 feet Components: V, S, M (a rotten egg or several skunk cabbage leaves) Duration: Concentration, up to 1 minute You create a 20-foot-radius sphere of yellow, nauseating gas centered on a point within range.. The cloud lingers in the air for the duration or until a strong wind (such as the one created by Gust of Wind) disperses it. Each creature that starts its turn in the Sphere must succeed on a Constitution saving throw or have the Poisoned condition until the end of the current turn.