Not one case in particular, but this player (Loben) has a history of making one-word posts without adding anything to a discussion. These usually take the form of 'heh'. I'm sorry for the abundance of links, I tried to gather as much evidence as possible.
viewtopic.php?p=34852456#p34852456
viewtopic.php?f=20&t=452607&p=34829974#p34829974
viewtopic.php?f=20&t=452607&p=34829457#p34829457
viewtopic.php?f=20&t=452603&p=34825122#p34825122
viewtopic.php?f=20&t=452396&p=34820541#p34820541
viewtopic.php?f=20&t=452396&p=34811751#p34811751
viewtopic.php?f=20&t=449364&p=34802265#p34802265
viewtopic.php?f=20&t=451813&p=34783683#p34783683
viewtopic.php?f=20&t=449364&p=34704270#p34704270
viewtopic.php?f=20&t=449364&p=34704195#p34704195
viewtopic.php?f=20&t=448249&p=34693138#p34693138
viewtopic.php?f=20&t=449475&p=34692131#p34692131