what you don't see is time freezing around pinkie during that GLK. soon to have her screw around with everything and every pony frozen in time. and after about 4 hours (in her time) she suddenly had a sugar crash right where she started.
This actually reminds me of one of my friends for some reason. We were in class and he had one of those mini cans of Monster, and he had it in his pocket, While the teacher was giving her lecture, she stopped and asked, "Edward, what are you doing?" She asked when she noticed his hand in his pocket, to which my buddy Ed replied, "I'm just messing with this monster in my pants....oh and this drink." He pulled out the mini can while he pulled it out, and everyone busted up laughing, it was so perfect!