21. "We sent a memo that told of Fowler's call to poor Bob up to the Seventh Floor," 22. It bobs up and down to music. 23. In this play, the unanswered questions from decades ago bob up as the unanswered questions of today. 24. A few could bob up in the new U . S . pro league, but not like this. 25. As you travel around, your craft will bob up and down following every single detail of the terrain. 26. The head bobs up and down. 27. :: As you walk, your head bobs up and down a little ( see animation at right ). 28. Pied water tyrants often bob up and down when perched, and have a fluttering butterfly display flight. 29. After becoming friends with fellow messenger boy Bob Prichard, Jimmy decides to hook Bob up with his sister, Marge. 30. So what if they can barely bob up and down on the dance floor, because it is so crowded?