The "I gota pee excuse" is old. Yes- I know! However, it's helped me many a times! See for yourselves:
*me tying/fixing up her hijab*
Api A: Sara, bring it around your head and put up your red broach to pin it in place.
Api B: No Sara use the silver broach.
Api A: She's using the red one and that's final.
Api B: Sara, you're using the silver one, right?
*gets stared at by both Api's pointedly*
"I..me..uh..I need to pee."
*leaves as fast as she possibly can*