Electric Banana is a good name for this colour. It's almost day-glow. What could be better than day-glow? Black light glow of course. Unfortunately Adam doesn't have a UV light at his house but a picture will be posted of his hair glowing next time he's at my house. It will be interesting to see if the orange part glows considering Vermillion Red doesn't glow.
If you're trying something like this a good tip is to put the paler colour at the roots so that it's less likely to bleed into the other colour. If I had put red at the roots there's a good chance that when (if) he washed his hair the red would run into the yellow and turn it orange.
Another point to note when rinsing out a dye job like this is to just use your finger tips at the roots to move the hair about while you rinse it to stop the lighter colour getting smudged with the darker colour.

Overall the finished result is as I expected. I think a nice variation would be yellow and lime green.