Bob Is Throwing A Party

He decides that to break the ice at his party, he'll ask his guests what their I.Q. is. Hopefully this will strike up an appropriate conversation from there. The day of the party rolls around, and when the first guest knocks on the door, Bob asks the person what her I.Q. is. "275" came the reply. "Well that's great," says Bob, let's talk about ethereal astro physics. Bob and the first guest talk until someone else knocks on the door. "Hi, my name is Bob, what's your I.Q?" The new guest replies with "145." "Great," says Bob, and his new guest and him talk about calculus and statistics for awhile. Much later, another knock is heard. "Hi, my name is Bob, what's your I.Q.?" Bob asks the newcomer. The new guest shuffles a little and quietly mentions "75..." "Well that's awesome," Bob remarks "what kind of iPhone do you use?"