Because their horns don’t work
I naturally told him that the only cure is more cowbell.
(...I laughed. And he did not. Nor did the wife. Sleeping on the couch tonight! ... worth it!)
Because they lactose.
So I was in the shower with my girlfriend this morning, and I have one of those Moxie Bluetooth showerheads so I can stream music from my phone to my shower.
At different points during the song, I was (gently) playing the cowbell part on her butt, cymbals on her stomach, etc.
During the guitar solo, I picked up some of her wet hair and began strumming the notes along with the song. She gave me a nasty glare.
And then, it hit me.
"Sorry babe. I just can't help playing HAIR guitar during this song!"
The look she gave me....