Alan looked up, his mandibles twitching. Similar to some insects, Alan's mandibles held sensitive olfactory organs used to detect pheromones secreted by other insects. In other words, Alan's mandibles were not only used for biting things, but also greatly increased his sense of smell. And now, filling the whole train, was the light smell of vanilla.

[i]Where did it come from?[/i] thought Alan. When he attempted to detect it's source, it seemed like it had just come out of nowhere. The mysterious smell quickly brought back his paranoia, afraid it might be some weird kind of poison.

"Can anyone smell that?" he nervously mumbled, barely audible.