When I was a teenager I used to go to Denny's all the time with my friends and get a banana split. Without fail, if I turned my back for a second, my ice cream would be destroyed. Here's a solution. Take one. It's yours. Leave me be!
I tried to be haughty about desserts in jars and how it's such an obnoxious fad like taxidermy in bars and guys who ride bikes and grow beards. But then I had an amazing goat cheese and berry mousse in a jar and changed my mind. Put it all in a jar! All of it! I take it back! Jars are charming and it could probably be scientifically proven that they make food taste 25% better.