Crossword puzzle clue "prisoners who keep forgetting mealtimes and exercise hours"

Prisoners who keep forgetting mealtimes and exercise hours?

Some mealtimes

Dudes who promise you rides to nu metal shows but keep forgetting to show up?

Keep from forgetting, perhaps

Keep from forgetting

Prisoners' exercise areas

Only driver to win the Indianapolis 500, the Daytona 500, the 24 Hours of Daytona, and the 24 Hours of Le Mans

___ Snow, Russell Brand's character in "Forgetting Sarah Marshall" and "Get Him to the Greek"