Want to call in to work sick but dont have a "legit" excuse.. any excuses that anyone would believe?

i havent been feeling good and i'm supposed to work tomorrow but i really just want to rest. i've been trying tothing of a really good excuse that would my bosses would believe ( i have 3 bosses #1 is a groggy old lady who i really dont like, #2 is the biggest beotch and its very hard to convince her to let you not come to work, and #3 shes nice and she'd probably let me off work if i have a legit reason.) ive only been working (@ mcdonalds) for a month and a half. pleaseee help me