You know that old song by MC Hammer, "Hammer time"?

When I know it's time to pray, sometimes i sing that song in my head but I replace "hammer" with whatever prayer time it is.

"It's Fajr time! Daa nah na na, na na, na na, Fajr time!"

well, usually less so with fajr time since I don't have the peppiness to think in MC hammer songs at 5:30 in the morning. Maybe Duhr would have been a better example.