When playing Cho'Gath, pressing Q will work as intended, except the animation for the spell at the target location will play twice. The duplicated spell will work as intended, doing damage once, but only the animation is played twice, which can lead to confusing distractions.
1) Pick Cho'Gath (skin doesn't matter)
2) Throw Vorpal Spikes (Q)
3) Watch as the animation plays twice at the exact same rate every time.
**Video and screenshots:**
Screenshot 1 (First normal Q):
Screenshot 2 (Second duplicated Q):