This is by no means revolutionary just something I haven't done for a while that I just remembered about. So don't hate - if you do fuck you no one cares, there is at least 1 person that will prosper from this.
Its simple. Walk to the fridge, grab a redbull, pour it into your slushy cup, and top with slushy. Dispose can in garbage my slushy machines for straw wrappers. Pay for your slushy. Walk out with half a cup of free redbull. Win.
Get creative with your mixes. I just did a banana hybrid. Win.