- I'm glad we share a sense of humor and an understanding that I'm slightly funnier

Let them know how funny you are with an ecard written by someone else.

There are tons of different kinds of friends (or so we hear): best friends forever, best friends for now, friends with benefits, old school chums, drinking buddies, frenemies, mistrusted confidants, tolerable coworkers, recovering alcoholics you keep around because they don't mind being the designated driver—you name it. From time to time it's important to touch base with these people in order to let them know you still exist and consider their friendship important enough to take advantage of for a ride to the airport or to help move your couch. Here are 15 of the best ways to half-heartedly express your friendship in whatever form it takes. Feel free to share them on Twitter or Facebook or maybe even send some to your real friends!

Advertising - We'll be best friends forever because you already know too much.

Keep your friends close and anyone who's seen your browser history closer. - If you ever disappeared while hiking, I'd remain with the search party until it started raining

A true fair weather friend. - If ever you die from auto-erotic asphyxiation I promise to rearrange your corpse before it's discovered by your loved ones.

But not without drawing penises all over your face. - Let's talk soon because I miss you hearing the sound of my voice

"...and everyone else is tired of it." - If we were in prison, I'd help you not get raped

The inspiration for Shawshank Redemption. - If you ever need a slightly distracted, unsympathetic friend, I'm here for you.

Honesty and rock-bottom expectations are the foundation of the best friendships. - You're even more dependable than alcohol

A good card to send to your drugs. - I appreciate your friendship so much that if we ever got into a fist fight I'd totally try my best to avoid your face.

Your kidneys and genitals may not be so lucky. - I think we'll be friends forever because we're too lazy to find new friends.

"Meh-st Friends Forever" - I'll never tell anyone you take spin classes

Post on someone's Facebook wall! - I hope your recent bout of happiness doesn't ruin our perfectly good, mutually beneficial relationship built on complaining.

Great way to let someone know you're thinking about yourself in their moment of triumph.