If you change lines, the one you just left will start to move faster than the one you are now in.

Related:

• O'Brien's Variation on Etorre's Observation: If you change lines,
  the one you just left will start to move faster than...
• The other lines move faster. -- Ettore's Observation If you change lines,
  the one you just left will start to move faster than...
• The other line moves faster. This applies to all lines-
  bank, supermarket, tollbooth, customs, and so on. And...
• One of these days now,
  just you wait and see...
• Marge: [ruefully] We've left it all behind. How can you make a clean break with your life?
  Homer: Relax, Marge, I tied up all the loose ends before...
• Hardin's Law:
  You can never do just one thing...
• You know you've been hacking too long when... ...you check your email more often than your paper mail,
  and you remember your network address faster than your...
• Parallel lines never meet,
  unless you bend one or both of them...