Fill a cocktail shaker with fresh ice.
Add white rum, gin, tequila, vodka, orange liqueur, lemon juice, and simple syrup.
Shake vigorously for about 10 seconds, until well chilled.
Fill a tall glass (like a collins or highball glass) with fresh ice.
Strain the mixture into the glass.
Top with a splash of cola (or lemon-lime soda for a lighter variation).
Garnish with a lemon wedge or slice.
Serve immediately and enjoy!