Do you all realise a RAT is responsible for Endgame?
The whole plotline of Endgame revolves around Ant-Man returning from the Quantum Realm and basically telling them how time travel is possible, and Tony Stark works out the finer details of it, right?
But Ant-Man was stuck in the QR for years on our side, because those monitoring the experiment he was part of fizzled out of existence thanks to Thanos, and so the modified white van and everything else was eventually put into storage. But a rat wandering over the control panel turned on the machine inside and out he popped, ready to advance the plot.
Who would've thought it? Without that lucky rat, there would've been no Endgame, and Thanos would have still won.