Technology is changing mean older brother pranks. For every new method of little brother harassment enabled by technological advances (as seen below), there's two more that fall by the wayside.
Lacking a little brother, my own mean older brother behavior was mostly limited to forcing my younger sisters to play baseball and soccer in the backyard with me for hours. However, I heard legendary stories from friends who had little brothers, including one mean game called "the typewriter".
To do the typewriter, first you sit on your little brother and pin hia arms with your knees. Then, you drum your fingers on his chest, like you were typing in his sternum. Periodically, you slap their face and yell, "Ding!" Ah, the untapped violent potential of the carriage return.
Unfortunately, technology has made the typewriter obsolete. Modern older brothers have no idea why you would slap in that manner. Slapping a little brother they can get behind, but to what end? I propose a replacement prank: The blog. Mean older brothers can do the same typing move as before, but instead of the slap, they can flick the tip of the nose and right-click the nostrils. To mix things up, mean brothers can poke the middle of the little brother's forehead while yelling, "Refresh!"
Games involving slurping up a loogy right before it hits your little brother's face are timeless, and will never get old until the human race develops cybernetic salivary gland implants.