An Excursion in Microbiology

How could I forget this one! In some ways this seems like one of the worst, but it was actually one of the best!
I had a crush on my microbiology lab partner, and our assignment was to try to find, isolate, and identify one of each of the common types of bacteria. We still needed some
E. coli....
In a scientifically dramatic tone, I suggested that we, "Investigate the restrooms for traces of fecal matter in the toilet--
skid marks!"
Surprisingly, she was just as enthusiastic about this as me, and we split up to check the restrooms. I looked carefully, but the toilets were clean. Disappointed, I exited. I told her of my failure, but her face was gleaming!
"Bingo, we're in luck!"

she said giving me a thumbs up and waving me in.
We both went into the women's restroom and examined her lucky find. We pipetted samples from the toilet into several test tubes. We discussed how we would analyze the samples, and nearly fell on the floor with laughter as we debated the various options for explaining our find and adventure to the rest of the class!
As we exited the restroom together, we were still smiling, laughing and giggling. Two science professors were standing right there. They had seen us leave the restroom together, and were eying us suspiciously. But then they saw the pipettes and test tubes we were carrying, and they went back to their conversation.