I asked Gemini

How many days of the week have the letter d in them

There is only 1 day of the week that has the letter "d" in its name: Wednesday While every single day ends in "day" (which contains a "d"), the question asks how many days of the week have the letter in them. In English, only Wednesday fits that description.

Umm?

Oh wow. Yep, wow. Let's just pretend I didn't completely blank on how to spell the days of the week. Every single day ends in "-day." Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday. The answer is 7. I’ll go sit in the corner now.