I've not been playing with my online gaming group for a few months, but when I was, I was playing a sentient gelatinous cube, who's just the happiest and friendliest thing ever.
Last night I was able to rejoin, and we managed to pull off a great surprise.
The PCs were led into a trap, and suddenly all sorts of oozes and jellies started appearing. The DM did a great description of an ominous, looming gelatinous cube approaching, and one side started to form into a face... Which oozed into a mouth and said....
Which is when I popped into the call and laid on the familiar happy, friendly voice and said a hearty hello and nice to see everyone again!
Perfect timing, great build-up, everyone loved it. Such a great theatrical moment.
Clearly, the others are playing its snacks.