Which is the best one liner you've ever heard?

Choosing the "best" one-liner can be highly subjective, as humor varies greatly from person to person. However, here are a few one-liners that are often well-received and stand out for their cleverness and humor:

From Parade:

• "I told my girlfriend she drew her eyebrows too high. She seemed surprised."1
• "Light travels faster than sound, which is the reason that some people appear bright before you hear them speak."1

From Reader's Digest:

• "Why was six afraid of seven? Because seven eight nine."3
• "What do you get when you cross a polar bear with a seal? A polar bear."3

From Living Waters:

• "Time is what keeps things from happening all at once."4
• "I didn’t fight my way to the top of the food chain to be a vegetarian."4

From YouTube:

• "I was born for this list: You don’t need a parachute to go skydiving; you need a parachute to go skydiving twice."2

Each of these one-liners has a unique twist and can elicit a laugh depending on your sense of humor. The best one for you would depend on what type of humor you enjoy the most.