What is the most ridiculous result you have had in doubled or redoubled contract. I'll cite two. Both favorable. I conveniently forgot the bad results.
1) Over 40 years ago we sacrificed against a nonvul 4♥ contract. Went for 500. This was the days of traveling score slips. One of the opponents got laid when we had cold top with one round to go. Room in 4♥ making seven for 510.
2) Directing a small game, young lady shows up without a partner. I play with her so we will not have a half table. She opens 1N. Next hand doubles. I pass. She makes six. She had a balanced 22. She played better than she bid. For some reason, opponents had trouble counting her hand.
Plus... it's free!