Custard is essentially vanilla-flavoured, isn't it? So is Cream Soda, though it tends to be weirdly-coloured, never yellow. I think it was lurid green, when I was a sprog.
I remember using tinned custard as a substitute for advocaat, when a "Snowball" was demanded by a relative. She liked it! It's a good job I did not look up the recipe online, where a Snowball turned out to mean something not-so-vanilla!
Custard powder isn’t, strictly speaking, explosive. Any flammable powder at a suitable concentration, suspended in air, will flare up if ignited. lf said flare-up is confined, e.g. in a building, the results can be catastrophic.
Mythbusters has demonstrated such energetic displays using coffee whitener:
Sawdust will also work nicely:
When the ignition occurs inside a building, the results can be devastating:
Thanks for the replies! Cream Soda is certainly vanilla flavoured, but I don't think custard is, although I suppose you could add vanilla to it. Dr Pepper is marzipan flavoured, I do know that.
M&S rhubarb and custard fizzy drink is a new one on me, I bet it's expensive, though!
I wasn't so much thinking of a fizzy custard turning into a Molotov cocktail unintentionally, it was more the combination of custard and fizz creating a mint in the cola-style fizz explosion. But M&S have me thinking differently.