See this is what I do when on call, make up songs like this
Sung to the tune 100 bottles of beer on the wall
168 hours of on call to go, 168 hours of on call.
you mark it down, sit around, 167 hours of on call to go.
167 hours of on call to go, 167 hours of on call.
you mark it down, sit around, 166 hours of on call to go.
166 hours of on call to go, 166 hours of on call.
you mark it down, sit around, 165 hours of on call to go.
.....
Every line of the song means you weren't hit with a call, good times!