This experience happened just last Saturday.
My two friends buy a gram of MDA after being told it was just like MDMA, but "trippy". So anyway we all went out and it seemed like it would be a great night. I had a bit of an upset stomach but didn't think anything of it, i didn't want to let it ruin anybody's night, especially when we'd been looking forward to it for a month.
Me and my girlfriend both have a bomb of mdma, she precedes to come up within about 30mins and is happily rolling away for the best part of the night. In contrast it takes me about 2 hours to feel anything whatsoever, before which i notice my two very good friends who bought the MDA are having a pretty terrible night. Didn't like seein them unhappy so i gave them my last two bombs and hoped for the best they'd have a good time.
Anyway I finally "came up" if you can call it that, having spent two hours listening to my munted girlfriend and mate tell me how awesome the mdma was in the drum n bass room, and them yelling at me: "have you come up yet?".
Its a weak high, nothing like what i'm used to. I have to stand around in the cold looking for my two mates who i gave the bombs to as they've been missing for ages and i'm worried about them, cold is a major buzz kill. I then find out they just went straight home, what a waste. Whole high lasts about an hour, then i come down and it feels baaaad

wishing i'd kept a bomb for myself.
Steering clear of mdma for a few months, taking it as a sign, i put it down to the the upset stomach. wishing i'd taken another. At least some of my mates and girlfriend had a good time.