The Ambrosian Rite, used in Milan seems to be an altar boys delight. On some of the greater feasts of martyrs a great ball, made out of cotton waste is set on fire. This Youtube video seems to be less spectacular than some of the photographs I have seen. Obviously 'elf and safety" have made a visit. Must get a nice marble floor in.
Up until the nineteenth century during Lent the whole of the sanctuary in Duomo of Milan was veiled. On Wednesday of Holy Week the Passion according to St Luke was sung, when the words about the veil of the Temple being torn in two, at Jesus' death were sung the great veil in the Church was torn apart. Spectacular, but not too uncommon in various places, but in Milan it was accompanied by the repeated firing of a canon. Which in the rather oppresive gloom of the Duomo meant great flashes of fire, and great clouds acrid spoke.