One of these things is not like the other: Cellphone : Restaurant

Fire - Water

Water - Vinegar

Water - Cellphone

Cellphone - Restaurant

Rember the words to the song, "One Of These Things (Is Not Like the Other):"

One of these things is not like the others,
One of these things just doesn't belong,
Can you tell which thing is not like the others
By the time I finish my song?

Confucious ask:

Why do people suddenly turn in to idiots when they are in a restaurant and get a ringy-dingy on cellphone?

Confucious answer:

Maybe they were idiots before they got ring-dingy on their cellphone.