1 c. mayonnaise (not diet) (I use Miracle Whip)
1/2 c. chopped onion
3/4 c. diced celery
1/2 c. water chestnuts, drained (opt.)
3/4 c. bacon, crisp & crumbled
1 c. grated cheddar cheese
6 c. popcorn, popped

Can mix first 5 ingredients ahead, but, add the cheese and the popcorn (popped) just before serving.