I literally go through these about 1 bottle every 3-4 weeks:
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I use it on everything.
I still like ketchup on fries but the sriracha gives it an extra kick.
I love Mayo prawns but everything else I hold off on the Mayo XD.
That is the exact sriracha bottle that I have (the official name in some countries, seems to be "Flying Goose"); for mayo prawns (and that was when I started to add some sriracha - to taste - to mayo); I have also used some sriracha - to taste - when preparing classic "prawn cocktail" (Marie Rose) sauce - mayo, ketchup, a little Worcestshire sauce, lemon juice, salt, black peper, and pimentón (Spanish paprika).
But, I never thought to use it with ketchup.
A brilliant idea.
Actually, I only discovered this treat last summer, but have become an avid fan since then. There is little that isn't enhanced by a dash of sriracha.