Summer drink that might cause a brain freeze

ICEE

This frozen treat often comes in bright blue raspberry or cherry flavors and is commonly sold at convenience stores and gas stations.

This clue points to "ICEE," a popular frozen slushie drink often enjoyed in summer. The mention of "brain freeze" hints at the icy, slushy texture that can cause that sharp headache when eaten too fast. It’s a straightforward reference—no wordplay, just a common experience with a well-known treat.