Let's say you have a friend who has reacted positively to KAT-TUN and now you want to intro them to JE in general. You have one hour to show them whatever you want, PVs, clips from music shows, Shokura, anything.
The friend is high-school aged, so you don't want to go any older than KAT-TUN really, and doesn't know much Japanese, so subbed is best. Probably you will have the most success with things that are funny and/or cool (although a little fanservice would be okay). You want things that would appeal at least a little to guys too, hence funny/cool, and likely variety of shorter things will work best.
What do you show them?