AMC gives you (or gave me) a free large popcorn if you sign up for their free rewards program. Redbox also gave me a free rental, so I guess you could theoretically combine the two if you want to take home some bad movie popcorn.
Do Starbucks gold members still get free coffee of choice these days? I haven't been drinking Starbucks (too expensive) for many years after being a daily customer for 10 yrs or so - they stripped my status as gold member... so I don't know.