Sometimes I would think of practical jokes that specifically the Voyager could have been pulling off on each other; like acting like they're a holodeck glitch... one thing I found amusing was how often they would violate the temporal prime directive. Wouldn't it be great if, as a practical joke, a crew member would just laugh at every little thing, and then when asked "why are you laughing?", the crew member would reply, "Oh, I can't tell you; that'd violate the temporal prime directive..." oh man! Or maybe someone could hack seven's nanobots and inject them into somebody to make their hair turn purple? hah...
ha ha, your hair's purple, PREPARE TO BE ASSIMILATED RESISTANCE IS FUTILE... - it's all fun and games until someone gets Borgified. Here's one - transport someone while they're asleep to the holodeck, to an exact duplicate of the ship except everything is "grown-up" size and the person is child-size.
When Tuvok is sleeping, Tom and Harry transport him to the holodeck where he wakes up in a holodeck simulation where everyone on the ship looks and acts like Neelix.
Reprogram Janeway's replicator so her coffee comes out as decaf! The whole crew would suffer immensely
-Redesign the Doctor so he has a big red nose/six arms/a girl's voice/a flashing light on his head/ends each sentence with "OH YEAH!" - While he's asleep, surgically wipe out Chakotay's tattoo and redraw it on the other side on his face, so when he wakes up he thinks he's entered some weird mirror universe - Rewrite Janeway's personel file so her first name is Nicole. Just because. - Throw Harry out of an airlock. Based on the evidence of the rest of the series he'll be back in five minutes somehow anyway. - Attach little motors to Paris's conn chair, controlled from Kim's station. Be amused as you send him flying around the Bridge, and look all innocent if anyone looks at you. - Move all of Tuvok's furniture in his room to the mess hall. Make sure Neelix is there when he finds it. - Whenever Kes says something, say "Sorry Kes, I can't quite hear you, could you please speak up?" No matter how loudly she says something, I can never hear her. - Make up some totally ridiculous "human custom" and teach 7 of 9 about it. Watch her look silly when she tries to join in. - Throw Neelix out of an airlock. Warp away as fast as possible.
Replace the computers voice with Gilbert Godfrey's. Upgrade the red alert tone to a sub dive klaxon. Paint all the corridors lime green, and replace the carpet with hot pink.
In the Navy, a popular one is to streak buck naked from one side of the ship to another! Them sailors get awfully stir crazy stuck on a ship for months on end.....oh, the stories I've heard....
-replicate thousands of plush tribbles and fill B'lanna's quaters with them while she's asleep -transport Tuvok to the holodeck while he's asleep and program a version Voyager where only Sam and Max type moon logic works
Yeah and just before Harry can show them to anyone when they don't find anything, the readings delete themselves.