So it turns out the Hot Dog Stand theme from April Fools day doesn't go away unless you push the button to make it do so.
As a result, I've been voluntarily trapped in the Hot Dog Stand theme for three days.
It may be utterly hideous, but I'll be damned if I'm the one to crack first. Beating a website at a practical joke is a totally normal and possible thing to try and do.
Pity the timer resets every 24 hours though. By my count I'm on 55 hours and 18 minutes.