Invented languages have often been created in tandem with entire invented universes and most conlangers come to their craft by way of fantasy and science fiction.
If I'm pushed I'd also have to admit I don't like people with allergies. They just annoy me. There seems to be something far too self-centred about it. 'No thanks I'm allergic.' Why not just say 'No thanks'? I wasn't asking for your medical history I was just passing around the nuts. Trying to be friendly that's all.