Galactus vs YOU
I'm pretty quick and agile. I think, under the right circumstances, I could go toe to toe with the purple giant. Play with him with a little Rope-A-Dope, then dazzle him with my superior foot speed. Being thousands of feet tall has got to slow down your footspeed, seriously.
If that doesn't work, I point over his shoulder, say 'Hey look, a golden delicious planet!', then when he looks, I kick him in the nuts and run the other direction like a frightened schoolgirl.
What about you guys?