Why do kids act like tiny drunks?

Don’t misunderstand me, my child isn’t drunk. I just wanna know why she does some of the things she does. I’m not talking about getting wobbly when she walks, I understand she’s still working on motor skills and stuff. But some of the things she does are so irrational/funny/crazy/weird.

She just climbed behind me on the couch, pushed me off, then yanked the couch cushion off, sat on the bare floor, and started watching tv. Now she’s doing a weird side step shuffle pushing a plastic cupcake with her foot while she drinks her bottle.

Those are the only good examples I have at the moment, I’m sure I’ll think of more. Do they just do weird stuff because they’re bored or are they actually trying to accomplish something?