Fizzy Lifter
Brown sugar boiled by a dragon’s breath
This glass bottle contains a brown bubbly liquid and bears a winking wizard on the label. When you are unconscious and have at least 1 hit point, if another creature forces you to sniff this powerful concoction you immediately wake up.
Alternatively, when you consume this potion you are targeted by the levitate spell (save DC 14) but are also comically bloated with bubbles, taking a −2 penalty to Constitution saving throws for the duration.
Ideally the combination of these two confections should be left ambiguous but indescribably bad. It should be a “relative of a friend of a friend died from it” sort of legend and the Narrator should create any mad reactions that they feel are interesting. However, if an adventurer ignores the warning and consumes both items at once this optional effect may be used:
When a creature consumes both fizzy lifter and fizzy rocks within a minute of each other, the arcane chemical reaction causes the effects of both items to end and a torrent of harmless foam to rocket out of the creature’s mouth, propelling it in the opposite direction. Determine a direction randomly by rolling a d8. The creature is pushed 100 feet in that direction. This movement does not provoke opportunity attacks . If it impacts a creature or object along this path it stops, is knocked prone , and takes 23 (5d8) bludgeoning damage, dealing the same amount of damage to whatever it impacts.