Go to cashier 12 at Dominion at Bloor and Spadina, between 10:30 and 11:00. She will tell you which dozen eggs to buy from the dairy section.
Break open egg number 6 (they'll be numbered), and the wee midget leprechaun inside will give you a little wee key. Take the key, swallow it, and the even smaller leprechaun in your tummy will open the little wee safe he keeps in your tummy (unless you've increased your fibre intake lately, then too bad, no Kool Haus for you, unless you go swimming through the sewage treatment plant for a key the size of a grain of salt); he will write the message contained in the safe onto a piece of paper (oh, yeah, when you swallow the key, also swallow a piece of paper and a wee little pen), tickle your throat until you cough up blood and a piece of paper from your tummy.
On that paper will be the entrance to Kool Haus.