She was still feeling bloated from lunch, so she was fearful of farting in front of her date, who hadn’t arrived yet. It wasn’t long before she actually did let one out, but she managed to cover up the sound with a fake cough.
She continued waiting for her date to arrive, but wanted to make sure everything was perfect. As she bends down in her chair to get the mirror from her purse, she accidentally farts quite loudly just as the waiter walks up.