A character, coming across some unknown substance, will always smell it with a puzzled expression, then hesitantly taste it. It is almost always something that most people would definitely not want to put into their mouths, but the character somehow decides that this is the best way to determine what it is, because he might just want to know, "Is It Something You Eat?" for himself. May lead to It Tastes Like Feet or I Ate What? Fingertip Drug Analysis and The Ketchup Test are subtropes. Examples of Sniff Sniff Nom include: