Kids!
A lot of talks mention the duties that parents have towards their children in teaching about Islam and setting them up for later life (and this isn't even the core subject being discussed, it just creeps up!
I guess it is something worth discussing considering stories you hear about kids gone bad and all that, but with pretty much all of the talks discussing technology and the media that kids are exposed to (which might desensitise them to certain activities and consider them 'normal').