Some of the simplest effects I never knew existed online are the very basic “Your Face Here” types of photo altering programs. The concept is simple, you find a template you like, upload or crop a picture of yourself—or whoever—and plug the face into the image. There are all kinds of sites like this on the net.
One of the easiest, free sources for making your own funny picture memes is MemeGenerator.net . They have a huge gallery of memes that users have previously created, plus another gallery of the images without captions if you want to give them a go yourself.
If you want to start from scratch, you can click on the “generate an image” button and choose your own pictures from your computer or grab one from elsewhere on the net. This is how a lot of the hilarious movie stills and captions are made. Then you can customize a new background or just go right to adding the captions.