Barriehie
Forum GOD!
You need irregularities on a surface to give the bubbles something to form on otherwise the water can become superheated. Superheated is hotter than boiling but it hasn't changed state to a gas so the slightest bump can be just what is needed to flash boil the water, spell steam explosion. The spaghetti is irregular, even though it looks and feels smooth, it's just rough enough to work.????
It's like the reverse of seeding clouds to make it rain.