Code:
 
on *:TEXT:!sa:#:{ 
  if ($nick isop $chan) && (%annoy == on) { 
    /msg $chan I'm done annoying %anick $+ ! 
    unset %anick 
    set %annoy off 
  } 
} 

on *:TEXT:!annoy *:#:{ 
  if (%annoy == on) { /msg $chan I'm already annoying %anick $+ ! Wait your turn :D 
    halt 
  }  
  else { 
    set %annoy on  
    set %anick $2 
    if ($nick isop $chan) { 
      /msg $chan Time to annoy %anick $+ ! 
      halt  
    } 
    else { /msg $chan Don't tell me what to do! } 
  } 
} 
on *:TEXT:*:#:{ 
  if ($nick == %anick) { 
    /notice $nick $1-
Type !annoy nick to copy his words
Type !sa to stop