system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are sticky things sticky?

I was eating a cupcake and the frosting was sticking to my fingers, and it made me think: What makes stuff stick (e.g. adhesive, syrup, etc.)?  What is going on with sticky substances that make them act the way they do?
gpt
For those kinds of foods, it's the sugar. The molecular formula for sugar allows it to make fairly strong bonds (Hydrogen bonds) with water. So whenever you mix the two, they bond together, or it becomes "sticky". In addition, you hands have a lot of moisture/sweat on them, so if you hold sugar in your hand, the sugar will bond to the moisture and stick to your hand. 

EDIT: grammar 

EDIT2: extra word.