The first time was while under Vriska's mind control wherein he ended up killing Aradia and her lusus, as well as leveling her hive. The second time was accidentally while sleeping, which resulted in the destruction of his roof and his own lusus. Later on, he uses similar eyebeams in a fight against Eridan, and then again in a second duel later still, both without visual eating of mind honey, so it appears that he is capable of generating them on purpose under normal circumstances. The mind honey seems to simply increase the effect and render it uncontrollable.