I guess her Spidey-Sense was wrong

So a couple of years ago my sister, Shorty, and I were sitting around and she kept hearing this noise. She thought that I had carpenter ants. She could hear them in the bannister by the stairway. That was the only place she could hear it. She said "I know you have carpenter ants...My spidey-sense is telling me." Eventually she grabbed her soda from the bannister to take a drink...and she realized that she had just been hearing the fizz from her soda.