Extendable Arms

Take a cartoon, preferably an older one, and find a pair who always end up in fights. Tom and Jerry, Dick Dastardly and Muttley from Wacky Races or virtually anyone from Looney Tunes. Somehow, one character always has a fist which can stretch across an entire country. Or a universe. This is a type of Toon Physics, and is often used with revenge.

Not to be confused with Rubber Man

Needs a Better Description

Examples:

Film

In an exceedingly rare live-action example, in the Chinese kung-fu movie Master of the Flying Guillotine, an Indian fighter enters a tournament with the power to extend his arms to an absurd length.
Michael Jordan uses this to make a slam dunk in Space Jam.
Freddy briefly extends both his arms to scare his victim in the first A Nightmare On Elm Street film.

Western Animation

In The Thief and The Cobbler, the Witch uses this to pull down a hesitant character (who s much bigger than she is) for examination.
Tom and Jerry demonstrates this several times, often when Tom tries to reach for Jerry inside one of the walls.
- Often used in conjunction with strategically placed mousetraps.
Used by Dick Dastardly whenever Muttley starts laughing at him, outside the range of a typical human being.
Pinkie Pie from My Little Pony Friendship Is Magic has these, but she uses them to pull her friends in for a group hug.
On Family Guy, Lois's father once punched Peter through an email.
Though it doesn't involve combat, the mid-1980s Scooby Doo series had Daphne restrain a fleeing Shaggy by extending her arms from off screen.

Video Games

This is one of Dhalsim's special abilities in the Street Fighter series--he can punch you from the other side of the screen.
In Sonic Unleashed, Sonic has arms that extend in his werehog form.