This Easter Egg can only be found while drunk

In GTA 5 Online, there are nightclubs that offer alcoholic drinks. One of these drinks gives you the blackout of your life and makes you wake up in strange places.
Where is the Easter Egg hidden? Just go to the nearest club. Order a Macbeth whiskey shot and down it. This good drink costs a mere $350. What your character experiences now remains unknown to you. You only see the consequences and wake up in the craziest places.
It takes you under bridges, half-naked to Mount Chiliad, and with a lot of luck, you wake up on the roof of the Epsilon Building. In that case, you receive an exclusive shirt that then belongs to you. The Epsilon Program is a parody of Scientology in GTA 5. The shirt says “Kifflom,” a popular word from the Epsilon Program.