"It's very useful, once you know what someone associates with certain tastes. There are a few universal responses to certain tastes, but those are not quite as effective." Of course, that meant knowing your target fairly well, which Itachi sometimes did if he'd been tracking or tailing someone for a while. That was usually what happened. Itachi could pull off an excellent interrogation, but he was usually sick afterwards. He hated it.

"It's probably not the kind of thing to bring to test gennin with. Though an auditory genjutsu of someone calling for them might be good...." Itachi looked past Sasuke's left shoulder in contemplation, then back at his brother. "The real question is, can you break it?" Itachi quirked an eyebrow at Sasuke and diplomatically sipped his tea to keep from smirking.