This sheet is very similar to my first grade Did You..? sheet, in that students have to guess if you know how to do something or not, and then play bingo with their answers vs the truth (correct answer = one filled bingo square).
Click here to download the sheet (save the document to your computer to make it display properly).
This is great for you and the students to bond - they love hearing more about you and your wacky gaijin life.
That's pretty much all there is to it, though you can add a writing exercise using some of my blank handwriting sheets ("Mr Dom knows how to ski, but doesn't know how to make takoyaki").
You should be able to fill about 20 minutes with this, plus a little more for writing.
Simple, effective, free!
As always, you can use this as many times as you won't, but please don't reproduce it elsewhere.