Which sentence uses sarcasm to make a funny point?
my shoes will melt into the sidewalk if i stay in this heat any longer.
my artistic skills rarely go beyond drawing stick figures.
my car looks brand new with its rusted fender and dented doors.
my sister has read her favorite book at least fifty thousand times.

My car looks brand new with its rusted fender and dented doors.

Explanation:

Sarcasm is when someone say something opposite to the actual scenario, to mock something just to make it funny in a delighted way of humor. "My car is brand new" is totally opposite to "it's rusted fender and dented doors".

Clearly his car is old, has rusted fender and dented doors which means  poorly managed, but he for the sake of laugh or to make it funny mentioned it a brand new car.    

in other words

to put it differently

for one thing

as an illustration

in this case

for this reason

to put it another way

that is to say

with attention to

by all means

important to realize

another key point

first thing to remember

most compelling evidence

must be remembered

point often overlooked

to point out

on the positive side

on the negative side

with this in mind

notably

including

like

to be sure

namely

chiefly

truly

indeed

certainly

surely

markedly

such as

especially

explicitly

specifically

expressly

surprisingly

frequently

significantly

particularly

in fact

in general

in particular

in detail

for example

for instance

to demonstrate

to emphasize

to repeat

to clarify

to explain

to enumerate