I introduced (well, this is technically like the 10th time my Juniors have seen end behavior in their math careers) end behavior to my 11th graders in January by showing quick video, going over some notes, and playing a game for closing. The video is short and the guy was entertaining enough where my students mimicked for a few days. Even to this day if we talk about end behavior my students will use this guys expressions.
The game was created by Rebecka Peterson. I did not think I would of been able to watch everyone's hands (especially odd functions with my direction facing them) so each student was given a laminated graph and pipe-cleaner to bend to create an example. I have moved away from my students using dry erase boards because in my tiny room and 33 open markers I was having KILLER headaches (smell is my one strong scent). Pipe-cleaners for a variety of topics and this is one of them!
Educator who loves math and working with students.