Get a coil of super thin string, make sure it's clean, cut it into uneven strands and sparsely decorate food with it.
Terraria Community Forums
Tibithia Σ
Yello_X
"Edible" gold leaves just like what they use for fine dining, but plot twist! They're not actually edible!
Adalicia
I would suggest a laxative to annoy, and refuse to list a poison that would satisfy the second question.
Admiral Voidzuli'
Zyclon B
Champion Greninjoid
Lime juice.
Schparks
Antidiarrheals to annoy. Having to sit on the toilet for forever is annoying.
As for poisons, I know too many to list and they all have varying affects.
As for poisons, I know too many to list and they all have varying affects.
Champion Greninjoid
Only Zparks can say that they know too many poisons to count and also use a in the same sentence.
in the same sentence.
Schparks
Come over to dinner sometime,@Champion Greninjoid. 
Kane Schmitz
Give them a glass of hotdog water
Schparks
Hot-dog water ice cubes!
Kane Schmitz
or stick your balls in the water
JabbaD
Human