Tables 2-4? It's time to text your friends not in the class.
Table 5? "Professor? Will this be graded?"
Table 1? They are pulling out their course notes. Choosing sides to debate the issue. Raising their hands to ask clarifying questions.
Tables 2-4, you will serve food to Table 1 one day.
Table 5, you will never advance in Table 1's company.
Table 1, you kids are going to rule the freakin' world.