well, that depends, what caused the mushroom cloud?
if it was a bomb/nuke: FFFFFFFFFFUUUUUUUUUUUUUUUCCCCCCCCKKKKKKK!!!!!!!!!!!!!!!
if it was smoke: mmmmmmmm.......BBQ
if it was a bomb/nuke: FFFFFFFFFFUUUUUUUUUUUUUUUCCCCCCCCKKKKKKK!!!!!!!!!!!!!!!
if it was smoke: mmmmmmmm.......BBQ