What ever shall I do with them?

I walked upstairs to go to the bathroom and I smelled the tell-tale stink of nail polish. 
"Are you playing with nail polish?" I asked, thinking this was a rhetorical question. I looked into the girls' room. They were waiting for Daddy to finish putting them to bed, supposedly, both in Ruth's top bunk. 
"No," Ruth said, succinctly. I went to the bathroom to do my business and think for a minute whether or not I believed her. The whole upstairs stunk. I wasn't home all evening. For all I knew the stench was left over from earlier.  As I was debating, Hannah knocked on the door and sheepishly said, "Mama, Ruthie and I were playing with nailpolish." She knew what her fate might be for lying, and quickly calculated she might bail herself out with the truth.
So I lectured and disciplined Ruth for lying, sneaking, and for using nailpolish in one's bed. I let Hannah know she was also in trouble for playing with nailpolish, but gave her praise for telling the truth. I let her know it "could have been worse."  That finished, I sent them back upstairs to finish their bedtime routines.
A little bit later, Jeremy went up to put the girls to bed, and decided he was going be The Intimidator, giving yet another lecture on lying. "So, I hear you weren't honest with Mama about the nail polish. Lying is a very bad..."
PTHHHHFFFFFTTT!  Hannah ripped a loud one. She giggled. Eyes wide as saucers staring at Daddy, she covered her mouth. Jeremy tried to hold back his laugh.
"People who lie..."
PBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBTTTT!!!!!!!!!!!!!
Hannah ripped another one, still trying to hold her giggles back with her hands.  Jeremy took two deep breaths, turned his back on the girls to contain himself, and then started all over again.
"Ok, here's the deal. If we catch you ever lying again..."
Pbttttttht!  (giggle)
"I will personally..."
 Pfffffft Ptttttt  (giggle)
"Uh..."
 PBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBTTTTTTTTTT!
"BWAAAAAAAAHAHAHAHHAHAHAHAHAHAHHHAHAAAHAHAHAHA!!!!!!!!!!!!!"
Jeremy never did finish his lecture.