Only Left Hand Can Do It

Riddle: What can be done only by your left hand and right hand surely can't do it?

Answer: when you want to cut your right finger nail.

Source: https://www.riddles.com/6241

What can be done only by your left hand and right hand surely can't do it? — Only Left Hand Can Do It by Harun Hassan v1.

Riddle: What can be done only by your left hand and right hand surely can't do it? Answer: when you want to cut your right finger nail. — by Harun Hassan v2.