Not exactly a 1-3 year timescale, but Elon Musk tweeted something about Signal earlier this month, causing SIGL (completely unrelated to the messaging service to which he was referring) to spike from ~$0.50 to $40 per share. Three weeks later, and SIGL seems to have settled down at around $5 per share - 10x the original price. In other words, the price after the shock is not correlated with the price prior to the shock.
