Many of us incorporate a joke of the day into our Circle Time or Morning Meeting. Here are some school-appropriate sites to get jokes to program into Big Macks, Step-by-Steps or higher tech AAC devices.
Joke Master Jr. 1, 2, or 3. It is available adapted or unadapted. (I strongly suggest if you are going to purchase an adapted one you go with Enabling Devices over JC Cooper at a savings of about $40.00. Forty freaking dollars! That's insane! Or adapt it yourself and save even more.)