Escapade!
An interactive fiction by Juhana Leinonen (2008) - the Inform 7 source text
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Every turn when the player is in the portal:
If a random chance of 1 in 6 succeeds, say "[one of]The floor/ceiling goes fump. fump. fump. as you go past it.[or][c]How's...[line break]...it...[line break]...going...[line break]...in...[line break]...there?'[or]The trapdoor and the switch on it flash by at breakneck speed.[at random]";
say "[silent c][run paragraph on]". [so that the creature doesn't go saying anything else while we're in the portal]