One of our classmates is so stupid

One of our classmates is so stupid:
he always carries a spare tire just in case he ever buys a car without one.
 
One of our classmate is so stupid:
He can't even dress himself yet.He can only dress other people.

One of our classmate is so stupid:
The football coach told him to jog three miles every day. The last time we heard from him he was somewhere around Wichita, Kansas.