"I just kind of leaned over. If I didn't catch it, it probably would've hit my dad in the head," he said.
Eisenlohr was sitting in row five of section 101 when the ball came to him, and was aware of the significance of the home run when he caught it.
"I was watching the games on TV and they were talking about [Thomas] hitting 500," he said. "After I caught it, everyone was giving me high fives."
With Twins pitcher Carlos Silva struggling early against the Jays, Eisenlohr's father Lyle knew the time might be right for history to be made.
"They started hitting on Silva and I saw Frank Thomas was about to come up, and I told my wife, 'The way Silva is pitching, Frank Thomas has a chance at hitting a home run.' The next thing I know, the very next pitch, here it comes," the elder Eisenlohr said.
While Eisenlohr said he might try to sell the jersey he received from Thomas because "it's a Blue Jays jersey," he did say he plans to keep the bat and ball and that he had no thoughts about parlaying his new possession into a financial gain by selling the ball to Thomas or the Jays.
"I don't really care about that. It's just money," he said.
Thomas said he appreciated Eisenlohr's willingness to give up the ball without asking a king's ransom.
"That was very classy of him, he was very gracious. He's a nice guy," Thomas said of Eisenlohr.
As for the ball? It will stay with Thomas, unless a certain institution focused on baseball history comes calling.
"I'm going to keep it unless the Hall of Fame wants it," Thomas said. "If they want it, I will probably give it to them."