Related Clues:

• Laugh sound
• Party snack
• Snack food choice
• Party snack (and a hint to this puzzle's circled letters)
• What 17-, 26-, 38-, and 52-Across contain
• *Party bowlful
• Bar freebie, and this puzzle's theme
• Craaaazy assortment in a can
• Hiking snack found in 16-, 23-, 39- and 50-Across?