I have.
One fine day this 'summer' I was sat out on the lawn.
The sun was behind a large cloud which was moving left.
Just to the right of that there was a smaller cloud moving right.
This smaller cloud was very colourful - like two rainbows one above the other.
I was saying those colours to myself in their order,
but realised that the colours
weren't in the right order.
Before I could fix the order of colours in my mind,
the sun emerged from the cloud on the left and the colours vanished.