A gun only has one trigger.
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)
An extroverted physicist looks at shoes when they're talking to you.
I think he would be most strict on nail gun control. (Credit to Taylor on PKA)
More guns.
When you exit a museum, you trigger the alarm.
The bomb vest actually does something when triggered.