I Pretend was created in 1968.
C'mon Let's Pretend was created in 1999.
When I Pretend to Fall was created on 2003-05-06.
Pretend or Surrender was created on 2008-04-30.
Pretend We're Dead was created in 1992.
Pretend You Don't See Her was created in 1997.
Time to Pretend was created on 2008-03-03.
Pretend You're Alive was created on 2004-07-27.
Pretend - Cheri Dennis song - was created in 2007.
Let's Pretend We're Married was created in 1981.
Pretend You Don't See Her - film - was created on 2002-01-12.
Nick Swardson's Pretend Time was created on 2010-10-12.
There is not an official system created by Habbo to do this. However, you can pretend (perhaps with another player).