When an Ann Arbor, Mich., man decided to run naked down the street to prove a point to his reluctant girlfriend about the importance of taking risks, he was unaware of just how big a risk he was about to take.

The man, whose name has not been released, was allegedly chased by another man with a gun, according to Lt. Khurum Sheikh of the Ann Arbor Police Department.

"This was not a typical case," Sheikh said. "It was a compound of strange things that just kept getting worse."

According to Sheikh, the man and his girlfriend were in their apartment discussing marriage. The girlfriend said she didn't feel ready to tie the knot, according to Sheikh, and her boyfriend replied that taking risks is an important part of life. To demonstrate his point, he hopped naked out their first-story window.

Down the block, the alleged gunman, who later told police he was an Army drill sergeant, was walking a friend home when the naked man spotted them. The would-be fiancé hid in the bushes to avoid being seen, Sheikh said.

But the alleged gunman saw him and chased him down the street.

"He was probably thinking this person was up to no good," Sheikh said. "I'm sure it looked suspicious."

After the alleged gunman fired into the air to show he was serious, a resident called police to report a gunman chasing a naked man down the street. Officers arrived and arrested him.

No one was hurt, Sheikh said.

The alleged gunman does not appear to be in the Army and also has no permit to carry his .40-caliber gun, Sheikh said. Police said there was no explanation as to why he was armed and why he claimed to be a drill sergeant. He was arrested and held at the county jail on charges of aggravated assault and carrying a concealed weapon.

The naked man was not arrested and suffered no major injuries.