I have never witnessed that happening, Neko. But I have seen something similar. If you barely tap the left or right key to enter a teleporter, then once you turn around you can keep walking toward the wall without teleporting back (assuming, of course, that the teleporter is against a wall). (This is a good way to use

on 6.0.)
While we're on the subject, I know also that if you throw a bomb at the right moment when going through a horizontal teleporter, you can essentially prevent Igor from teleporting (because once he gets through, the upward motion makes him go back through again). (This has cost my brother a life on a few occasions, on levels like 33 and 44.) I am sure most players already know this, but as it isn't written anywhere I thought it was worth a mention.