Maximized Prismatic Spray...?

[Saph]

I thought about this a while ago and I came to the conclusion that it breaks D&D with an infinite loop.

Sounds right. You roll one 8, which means 'struck by two rays' and have to roll twice more. Each of those results is also an 8, which you have to reroll. You never stop rolling 8s and never get two colours, causing an infinite loop that takes place in a finite amount of time (the six second round duration). I haven't done enough high-level maths to figure out what ought to happen next. Probably either the spell fizzles, or the universe ceases to exist.

- Saph