Hahahardon
When you laugh so hard you’re also getting a boner because the situation is so crazy it makes your brain and your junk laugh at the same time.
I saw my dad try to dance with a vacuum cleaner. I laughed so hard my junk joined in.
My friend told a joke about a chicken that also had a PhD. I laughed so hard my junk got a degree.
I watched my brother argue with a microwave and it looked like a war. I laughed so hard my junk was also fighting.