After we got married last summer, we were sleeping for work. I'm married to a hearing man, and I tried to warn him before about my vibrating alarm clock, he was fine with it. But he never felt it before.
SO...
First night, alarm goes off. I wake up, and I see my husband literally FLY out of bed. I turn off the alarm and he came back in asking what that was. I told him it was my clock and he said "Oh seesh! I thought it was something like an earthquake outside or if there was police here! I was looking outside the windows to see what the heck was going on!"
he knows now what it is and doesn't even move anymore.