Jokes for distinguishing the D / Th

I know some Spanish speakers mix up the sound the D makes and the sound the TH makes (yes I realize th has different sounds).

I saw this meme today and though "That's a perfect example of this minimal pair." For those of you who don't know this meme is one of the many floating around the internet that always ends in, "you're going to have a bad time."

For example, "If you don't do homework in my class.... you're going to have a bad time."

"If you don't compliment your girlfriend's haircut... you're going to have a bad time." etc.

This one's especially humorous to me because of the play on words. As most of you may have figured out I have been in a big joke mood lately and am currently compiling a series of  knock knock jokes and other jokes that deal with minimal pairs and connected speech. Since this meme popped up I thought I'd share a few jokes I have as well:
 

D / Th

·     Knock Knock. Who’s there? Dishes. Dishes who? Dishes your friend let me in.  This is your friend.

·     Knock Knock. Who’s there? Datson. Datson who? Datson awful question to ask. That's an awful question to ask.

·     Knock Knock. Who’s there? Dakota. Dakota who? Dakota’s too thin. Please open the door.  The coat is too thin. Please open the door.

      Knock Knock. Who’s there? Gladys. Gladys who? Gladys isn't a robber, aren't you? Glad this isn't a robber, aren't you?

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NOTE: The Th and D sound are normally mixed with a voiced TH however since the meme used an unvoiced TH as an example I chose to to delve into this.

Do you know any fun jokes or tricks for helping EFL students with the differences? Would you ever use a meme or knock knock joke in your EFL class? Are you laughing, but only because these are so lame? Leave a comment and let me me know.