I should only get one every couple of days they way I configured it (I think,) so perhaps requires more stocks. I wrote a different question onto each one, so I could easily get different reminders on the same day.
If anyone else knows a better randomness generator for IFTTT (I couldn't seem to use "someone followed me on twitter" as a trigger...) then pipe up!
- You could use the RSS trigger and pick a feed which is relatively random. E.g. Reddit front page post matching "cats".
- You could use the NY Times trigger to search for a common news term e.g. "obama"
- You could use soundcloud to trigger on "new public track by someone you follow"
- If you wanted to go crazy, you could get a wemo motion and point it out your window
I also have it set up so when I reply to the text message it logs it into a spreadsheet. My plan was to do some machine learning on my productivity. Haven't gotten around to that part yet though.
You might want to check out iDoneThis, which send you an email at the end of the day asking what you did. (I used it for about a month and then gave up, and it's less random, but it does log your responses.)
 https://pushover.net/ (links to both iOS and Play stores.)