You may have a Ad Sense Space for your Funny Image sites, check your Image Copyright, copyrighted images may give a trouble to get Ad Sense Account. Thanks
You can have you site up for Ad sense as long as the content of site does not fall any of these categories. Adult content Content that advocates against an individual, group, or organization Copyrighted material Drug, alcohol, and tobacco-related content Gambling content Hacking and cracking content Sites that offer compensation programs ("pay-to" sites) Sites that use Google Brand features Violent content Weapon-related content Other illegal content
Yes funny images sites are allowed as far as its not using any copyrighted material of the other sites or not adult one. But its very risky , it might result in getting your account banned