I remember it from Norwegian, national broadcasting at that time. In the clip we were shown, US soldiers played "Welcome to the junge".

Or perhaps the DoW pleases him with a D5 or an MM test soon? If it's about the optics, I mean.

He sure knows about the possible dangers of drinking tea...

All relevant isotopes of Pu have neutron # of ~3. Even the non-fissile ones may sustain a chain reaction through fast neutron fission bc of the high neutron # and the large fission cross sections. Carson Mark estimates a critical mass of 40 kg for alpha phase Pu-240 (massive sphere).