This is my one of college time 2d work ! Yepp a man swinging on a swing (well more like a rope instead).
Alrighty, one thing to note about this is, the man is swinging without losing out any Kinetic Energy.
Er..What?
Yep, i.e. the swing doesn't slow down.
(yea please pardon my fashion quotient out here for dressing him up in just an undie, I took too much of inspiration from superheroes I believe)
Again, this is a low res video.