Am I able to report someone for sitting a mount in the dalaran fountain and making my bobber unclickable?
Yes, please do report those miscreants. The category to use to describe it in your ticket would be "Zone Disruption".
or is there anything that can be done about it?
Baby Spice is quite effective.
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It's worth sending in, Quellek. What you describe can be considered a type of physical harassment. As always, our Game Masters are unable to inform you of the actions that we take in these situations, but they would be happy to investigate such a situation. >^.^<