A mnemonic used at my school to remind kids of proper behavior when attending (to) a lecture; it might seem self-evident, but many students with learning disabilities need to have the hidden curriculum pointed out to them…
S it up straight
L isten
A ct interested
N od occasionally
T rack the speaker
My kids find "Nod occasionally" the most humorous of these guidelines, and I get lots of bobbing heads after I introduce this. "Track the speaker" is the least likely to have occured to them; often, they know they should face the teacher, wherever sie goes in the classroom, but they hadn't thought about turning to face classmates when they speak.