Brushing the Luggage

My dad just came back from his honeymoon a week and a half early because he threw out his back. My dad said that he was moving luggage and pulled it out. His bride claimed that he threw out his back while brushing his teeth. Hmmmm
These are the possible reasons for the lies:
A- My dad did hurt his back brushing his teeth and tried to lie to cover it up. (I can't imagine how vigorously someone would have to brush their teeth in order strain their back.)
B. My dad hurt his back doing something else and they didn't have the time or forethought to work on their story. (This would make his wife an idiot if the best lie she could come up with is him brushing his teeth.)
C. My dad is telling the truth and Tanna misunderstood him...toothbrush and luggage do sound similar. (This is the least likely of the three.)

Honestly, I wish I didn't know my dad strained his back on his honeymoon. The only thing worse than knowing your parents are sexually active is knowing that they are breaking themselves in the act of copulation.