Type 1: True DDOI

Format

These types of posts follow the format of the original Don't Dead Open Inside. If the correct order of words is A B C D, the post's format is

A C
B D

or something reasonably similar. True DDOI is usually flaired as such.

Examples:

think trash pink cancer

Type 2: No Safety Smoking First

Format

These types of posts are like Don't Dead Open Inside, but inversed. If the correct order of words is A B C D, the post's format is

A B
C D

or something reasonably similar.

Type 3: The Sandwich

Format

These types of posts are not read correctly top to bottom or left to right. If the correct order of words is A B C D, the post's format is

A
C D
B
or
C
A B
D

Examples:

Star The Clone Wars Wars
Smash Immigrants Welcome Racism

Type 4: Mixed-in Words

Format

These types of posts have multiple words intertwined together. If the correct order of words is A B C D, and sum all = E, the post's format is

E

Type 5: The Mess

Format (This is just one of many ways it can take form!)

These types of posts are just a mess, and around 50% of the time come from /r/crappydesign. If the correct order of words is A B C D, the post's format is

B̴͏̢́̕A͡͝D̛C͟B҉͞A̵̢͜͟B̨̛͜Ć̨̧̀͘D̷͟͠҉́B̢̕͟҉B̶͏͜Ą̸͘C̵͝D͏̕B̡҉̛A̵̕C͏̀͝͡͡B̵̡D́Ą͜C̴͘͞D̵͜C̴̀͜͝͠A̶̢D̨̧͠C̴̸̷̀A̧͞͠D͘͠͡͠B̴̸B̶̸À̢̧̨͠D̶̵̡͏B̢̕͘͠C͏̨͢A͏̕͟͏ ҉͘Ḑ̶͘̕͞C̸̷͟͟Ą̵͢͞͠Ḑ͘͜B̧̧̢̛͘B̶̧̀D̵̀́B͜À̡̧̛B̵̵͟͡͞D̴̸C̷͝҉҉B̵͡A̧҉̀Ḑ̵̸̡̕C̴̷͝͞B̶̶͘A̢͜B̸͏̧͢D̴̢҉͏B̴C̸̕͡͞Á̵͠Ḑ̷̵̴͡B̡B̵̕͠C̴͏͢A͞͡͏D̕C̸̸̢̛A̢͡҉̧D̴̢͞͝B̵̀C̢̕͟Ḉ̴̵̧B̶̢A̵̶̛͢C̀ ̶̸̛̕͠À͡͏D͡͡B̛́͟͞͞À̛͝͏̧D̨̕͘͢B̷̡̛͘͠A̢̢̕B͢͞D̵́͞B͏̧̧B̀҉Ḑ̛͘͠B̶̢̧C̡͠A̶͏̛B͘͏͘͟͜D͜҉̵͝҉B̡͏̨̢ÀB͞Ḑ͏B͏͏̕͞C̷̶̡À͡҉̧̢B́̕D̶̢B̵̢̨͞A͢҉́̀̕C҉̧͠D̸̀́͞B҉̡̀A̷̢͡B́̕͘ ̵̨͟D̶̀͢͡B̴̶͢͝͞C̵̛͠͏̀À̴͡B̴̡̀͝D̸҉̶̀̕A̡҉̀ ͡҉̕͟B͘͞͏D̡͏̸͞A̢͠C̷̴͘B͞͏D̨̀͡҉B҉͘͢A̕͟͢C̛̀B͏̷D̕͟͝C͝͏̴̡A̧̡͝B̨̛͜D͏̸B̴̛͠͡C̸͜͞͞A̢͘͜B̴D͜͡B̷́́͠C̨͏A҉̢͟D͏̢C̨̨A̵҉̀͟B̶̶́͢͝Ḑ̀͞ ̡͜B̢́͜A͟͠D́B҉̵͜͠A̶͟͝Ć̸̛́D́B̶̢͢͠͝Ą͞͡ ͡͡͏̧͘D͏B̡͏̴̸A̧̨͞D̷͠B̴͘A̸̧͟D҉̡B̧B̢͢͡҉͟D͘B̵̸̧̀A̴͠B͝Ḑ̸́͘͟C̢͢͡A̷͝B̴́D̸̨͠C͏̛B̸̡̢̕͞A̸̛͟͠͞B̢͝͡Ḑ͜C̨͢͢͞ ̀͢͞͞Á́͠D̴́C͘͝A͏̀͝B͏͠D̷B̴̸̢͘À͏D҉́͟͞B̶̧̨C̷̢̀͜A͘͡B̢̀́͢͜D͏҉͠C͜͜B̡̢A̸̕҉D̢͘B̕͟͜͠C̵̶̀͜͡A͟͏B̢̧͢D҉̵̸C̸͟͡B̸̛Ą̧́͘D̵͘̕B̵̕Ć̨͜͡҉A̕͟B͘͏̀͝D̨́͞͡C̢͟͟B̴͘͡Ą̴͘D̶̴͘͘͠B̢́͟͜

or something reasonably similar.

Type 6: Fragmented

Format

These types of posts can be read correctly top to bottom or left to right, but contain lines with fragments of words. If the correct order of words is A B C D, the post's format is not demonstrate-able with this example, but I picked it for simplicity and it worked for most of the other ones. Just look at the format, or SASA LELE.

Type 7: Circles

Format

These types of posts contain one or more pieces of text arrange in circles. If the correct order of words is A B C D, the post can have words in the correct order but be misleading due to curved words.

Type 8: Different Languages

Format

These types of posts contain a vertical line of words that are read correctly, then another vertical line of words in a different language. While these might seem like DDOI at first glance, it's kind of cheating because nothing that unintentionally comes out of two different languages is going to make sense. If the correct order of words is A B C D, the post's format is

A А
B Б
C Ц
D Д

Type 9: Reversed Order

Format (missing image)

These types of posts are just reveresed, because they're on stairs or similar. If the correct order of words is A B C D, the post's format is

D
C
B
A

Type 10: All Repeated words/letters

Ones where the only words that are in the DDOI are just the same words stacked next to each other.

Quick example:

DON'T DON'T

OPEN OPEN