A joke about trembling

One day, a teacher, a student, a soldier and a priest were flying. At this time, the plane suddenly had an accident, but there were only three parachutes on the plane. This is, the teacher first grabbed a parachute and said, "I want to educate more students." ~"

He jumped down.

At this time, the soldier grabbed a parachute and said, "I want to protect the country."

I jumped down, and in the end, there were only students and priests left. At this time, the priest generously prepared to give the parachute to the students, but the students said, no need ~ there are still two parachutes!

The priest said, "How is that possible?"

The student said, "because I just don't know which SB jumped with my schoolbag on his back." . . "