I usually ask them to describe what they are seeing. Let them do the talking. If start asking, does it look like a ball of bees hanging from a branch, they may say yes, even though it's a large hornet nest hanging from the branch. Let them do the talking, so you don't put words in their mouth. That way, you hear the tell-tale signs of "paper nest," etc. Asking questions, and letting the other person do the talking, has led me to 100% honeybee calls and no wasps. The only disappointment was when the swarm was gone by the time I got there. I charged anyway and removed the remaining 10 or so bees. The guy asked while he still had to pay me, and I told him that I don't just get in the car and drive for an hour for free! He understood, and offered me a cup of coffee for the drive home.
justgojumpit