If you ever get sick of seeing those black bordered motivational posters, try visiting despair.com and take a look at their “demotivational” posters. I always get a laugh out of it.
My favourite one is WISHES: When you wish upon a falling star, your dreams can come true. Unless it’s really a meteorite hurtling to the Earth which will destroy all life. Then you’re pretty much hosed no matter what you wish for. Unless it’s death by meteor.
You can also do searches for “funny motivational posters” and find others that people have created (like the one of Darth Vader from Day 24).