1. Place the mugs and beer in the freezer for about 10 to 20 minutes before making the float.
2. Drizzle the desired amount of chocolate syrup / caramel into the iced mug. Add the ice cream.
3. Slowly pour the beer / ginger beer over the ice cream.
4. Top with more chocolate syrup / crystallized ginger and mint if desired.
Omit the rum if a non-alcoholic float is desired