I ran into this website and found some real funny quotes that not only make you sort of laugh, but think about it pretty seriously too.
Here are just some of 'em I randomly picked:
If the sky is the limit, then what is space, over the limit?
When French people swear do they say pardon my English?
"Cute as a button" Is that supposed to be a compliment? Since when are buttons cute?
Can you get cornered in a round room?
Why is it that if something says, "do not eat" on the packaging it becomes extra tempting to eat?
Can mute people burp?
Wouldn't it be smart to make the sticky stuff on envelopes taste like chocolate?
If you don't pay your exorcist, do you get repossessed?
Do vampires get AIDS?
What's the opposite of opposite?
If the #2 pencil is the most popular, why's it still #2?
What is a free gift? Aren't all gifts free?
Why is the word "abbreviate" so long?
How come French fries are not considered a vegetable, they are just deep fried potatoes?
Why does "slow down" and "slow up" mean the same thing?
Why does an alarm clock "go off" when it begins ringing?
They're not the LOL-type jokes, but they're pretty clever. There's a whole lot more in the actual link here (whose creator[s] I give all credit to).