"Yessity, yessity!" the students respond in unison, refocusing their attention.
"She says it, and after, we have to say it," Christian said.
"And like if she says it in different sounds, like grumpy, we have to say it (that way), too. That cracks me up," he said, clarifying for a reporter, "'Crack(s) me up' means that's funny."
It's this kind of rapport with her students, her colleagues say, that makes Troyer such an effective educator. And, it likely contributed to her recent award of South Bend's Teacher of the Year.
Troyer, who grew up in North Liberty, has taught at Warren for a year. She came to the school after having been at Wilson Primary Center for nearly two decades.
From the time her great-grandmother told stories about being a schoolteacher in a one-room schoolhouse, Troyer said, she's known she wanted to be a teacher.
And kindergarten, she said, has always been her niche.
She's seen it change over the years with a much more rigorous focus on academics.
To younger teachers, or those consider entering the field, Troyer has some advice.
"It's the most rewarding job," she said, "but you have to be ready to work hard and be dedicated. And you have to have a passion to teach."
Crystal Stremme, the kindergarten aide in Troyer's class, has worked by her side for the past seven years. In fact, she followed her to Warren this school year.
Troyer's easy-going way of dealing with students has inspired Stremme to deal with her own kids in the same manner, she said.
"She's definitely taught me (to exercise) patience with them," Stremme said. "She's a very positive person."
Back in the classroom Tuesday, Troyer addressed her kindergartners as though she were speaking to a group of NASA experts, explaining a seed-sorting exercise they were about to undertake.
"Now scientists," she said. "I'm very excited to talk to you today."
As she led the kids in using a tool to separate seeds by size, shape and color, her colleague, Pamela Hirschler, a fourth-grade teacher at Warren, took some time out to talk about Troyer's impact on her as a classroom teacher, as well as a friend.
Hirschler said she's transferring her own children out of private school so that her soon-to-be kindergartner can have Troyer as a teacher.
"Even though philosophies have changed, and methods of teaching have changed and curriculum has changed, her method of delivery, the way she teaches, hasn't," Hirschler said.
Another student of Troyer's, Iyana Phelps, said her teacher is special.
"And she's nice," her classmate, Christian, added.
"I know how to spell nice," Iyana interjected. "N-I-C-E," quickly changing gears and announcing, "It smells like cake in here. I want to eat cake."
Staff writer Kim Kilbride: