Curious (maybe it should be a poll): If you won a large jackpot, lump-sum or annuity (technically an annuity due that pays at t=0)?
Personally, I'd take the annuity, to guarantee that no matter what happens in the market, my payments are safe for 30 years.
Also, I'm told that the interest rate the lottery pays is actually decent due to the tax treatment, as they can invest the entire principal tax-free, so the interest accrues on the full balance, vs. the lump sum option where interest only accrues on the after-tax amount.