Sloppy Triumph, Clutch from Oz Pearlman, & the Biddle Trick are 3 of my favorites that play quite nicely.
Oh man, clutch is SO good.
I'd love to have the flexibility of a stand-up comic where I arrive at the venue and all I need is a microphone and an audience to put on an hour long show. I'm getting there but I may never attain it.
Man I agree, that'd be great. Towards the end of last year I did a 25 minute set with just a briefcase on a bar stool and a mic. People told me how much they liked that it felt like a stand up comedy performance but with really good magic.
I like props too much and sort of have a fascination with the idea of an interesting looking stage, so I don't really care for my production show I'm working on. But one of my goals is to put together at least 35 minutes, up to an hour, that only takes up maybe a small portion of my backpack so I have a show literally any time I see an opportunity or maybe get in a pinch or something.
On that note, I should probably contribute to the initial question...
Most (95%) of the card magic I perform is impromptu, from a shuffled pack. Every now and then I'll use gaffs or a card gimmick, but not regularly (for instance anniversary waltz or flash flight). One thing I do ALWAYS have is at least one if not two dupes. There are a some SERIOUS miracles you can pull of with just a single duplicate card. In a pinch you can use matching jokers too.
Here are some impromptu, no dupes routines I really like:
Clutch, as mentioned by Rick, is amazing.
An Invisible Thread by Helder Guimaraes is one of my favorites and a go to for a long time now.
Reswindled by Caleb Wiles is another reset routine I REALLY like. I almost stopped doing An Invisible Thread entirely, but I couldn't - it's just too good. They both are and in fact, reswindled is Paul Harris favorite version of his own routine lol
I do a triumph routine based around time travel. And then sometimes double exposure, which has also been mentioned and is also really good.
There's a routine I do where one person picks a card and their friend tells them what it is, twice. It won't fool the whole room but for that one person, it's brilliant. For the rest of the room, it's either funny or amazing - some people might see the working but it doesn't really matter for this one. I wish I could remember where I learned it.
Ambitious Card is really good but not because its ambitious card but because it gets one card signed, start with ACR and then I can jazz like crazy. Card to mouth, card under glass, card on shoulder, transpos, card under watch, etc. It's really fun when you eventually try to move onto something else but then nobody can pick anything other than the signed card lol.
There's so many more but I've got to get back to work for now!
JK just remembered a big one. Con-Cam-Coincidencia by Paul Wilson is one of the strongest impromptu borrowed deck effects I've ever come across. It takes a few minutes to perform, you need 3 spectators, a table, and good audience management to pull off so it's sort of situational and not one I always do. But when I do. Oh man. I literally cannot do anything else after it it's so strong. There really isn't much in my repertoire that can top it.
