Bob eats something that is a delicacy on Alice's planet and proceeds to get high
Subverted: Alice is given vinegar for this reason, but it doesn't work.
Double Subverted: ...because Alice has some weird recessive gene, and it would work like that on anyone else of her species.
Parodied: Alice gets high on fine wine and lobster, but doesn't think to mention it until she happens to attend a banquet.
Zig Zagged: Alice drinks vinegar and gets high, but it is revealed this was just an act. Later she eats cinnamon and gets high, but only because she has a special condition that makes this effect only in her, not the rest of her species. Another alien mentions that Jello is what really gets to them.
Averted: Alice gets high only on human drugs and nothing else.
Enforced: The main characters need a clue that Alice is not as human as she seems to be.
"Alice is acting really weird after drinking that vinegar; what is she, an alien?"
"You know you're not supposed to drink that, right?" "...But it makes me feel all sparkly inside..."
Invoked: Evil humans serve food with vinegar in it at a banquet, knowing that Alice will be intoxicated and no one else will.
Exploited: Bob keeps a small bottle of olive oil on his person whenever Alice is nearby, just in case.
Defied: Alice consciously sticks to food and drink from her own planet, knowing the possible side-effects human food may have on her.
Discussed: "Hey, guys, do you have any vinegar around here?" "No...not since Alice moved in."